diff --git a/openlp/core/display/html/display.js b/openlp/core/display/html/display.js
index c3e9f25b9..639308c67 100644
--- a/openlp/core/display/html/display.js
+++ b/openlp/core/display/html/display.js
@@ -235,119 +235,6 @@ function _createStyle(selector, rules) {
   }
 }
 
-/**
- * An audio player with a play list
- */
-var AudioPlayer = function (audioElement) {
-  this._audioElement = null;
-  this._eventListeners = {};
-  this._playlist = [];
-  this._currentTrack = null;
-  this._canRepeat = false;
-  this._state = AudioState.Stopped;
-  this.createAudioElement();
-};
-
-/**
- * Call all listeners associated with this event
- * @private
- * @param {object} event - The event that was emitted
- */
-AudioPlayer.prototype._callListener = function (event) {
-  if (this._eventListeners.hasOwnProperty(event.type)) {
-    this._eventListeners[event.type].forEach(function (listener) {
-      listener(event);
-    });
-  }
-  else {
-    console.warn("Received unknown event \"" + event.type + "\", doing nothing.");
-  }
-};
-
-/**
- * Create the <audio> element that is used to play the audio
- */
-AudioPlayer.prototype.createAudioElement = function () {
-  this._audioElement = document.createElement("audio");
-  this._audioElement.addEventListener("ended", this.onEnded);
-  this._audioElement.addEventListener("ended", this._callListener);
-  this._audioElement.addEventListener("timeupdate", this._callListener);
-  this._audioElement.addEventListener("volumechange", this._callListener);
-  this._audioElement.addEventListener("durationchange", this._callListener);
-  this._audioElement.addEventListener("loadeddata", this._callListener);
-  document.addEventListener("complete", function(event) {
-    document.body.appendChild(this._audioElement);
-  });
-};
-AudioPlayer.prototype.addEventListener = function (eventType, listener) {
-  this._eventListeners[eventType] = this._eventListeners[eventType] || [];
-  this._eventListeners[eventType].push(listener);
-};
-AudioPlayer.prototype.onEnded = function (event) {
-  this.nextTrack();
-};
-AudioPlayer.prototype.setCanRepeat = function (canRepeat) {
-  this._canRepeat = canRepeat;
-};
-AudioPlayer.prototype.clearTracks = function () {
-  this._playlist = [];
-};
-AudioPlayer.prototype.addTrack = function (track) {
-  this._playlist.push(track);
-};
-AudioPlayer.prototype.nextTrack = function () {
-  if (!!this._currentTrack) {
-    var trackIndex = this._playlist.indexOf(this._currentTrack);
-    if ((trackIndex + 1 >= this._playlist.length) && this._canRepeat) {
-      this.play(this._playlist[0]);
-    }
-    else if (trackIndex + 1 < this._playlist.length) {
-      this.play(this._playlist[trackIndex + 1]);
-    }
-    else {
-      this.stop();
-    }
-  }
-  else if (this._playlist.length > 0) {
-    this.play(this._playlist[0]);
-  }
-  else {
-    console.warn("No tracks in playlist, doing nothing.");
-  }
-};
-AudioPlayer.prototype.play = function () {
-  if (arguments.length > 0) {
-    this._currentTrack = arguments[0];
-    this._audioElement.src = this._currentTrack;
-    this._audioElement.play();
-    this._state = AudioState.Playing;
-  }
-  else if (this._state == AudioState.Paused) {
-    this._audioElement.play();
-    this._state = AudioState.Playing;
-  }
-  else {
-    console.warn("No track currently paused and no track specified, doing nothing.");
-  }
-};
-
-/**
- * Pause
- */
-AudioPlayer.prototype.pause = function () {
-  this._audioElement.pause();
-  this._state = AudioState.Paused;
-};
-
-/**
- * Stop playing
- */
-AudioPlayer.prototype.stop = function () {
-  this._audioElement.pause();
-  this._audioElement.src = "";
-  this._state = AudioState.Stopped;
-};
-
 /**
  * The Display object is what we use from OpenLP
  */
@@ -392,9 +279,9 @@ var Display = {
   init: function (options) {
     // Set defaults for undefined values
     options = options || {};
-    var isDisplay = options.isDisplay || false;
-    var doItemTransitions = options.doItemTransitions || false;
-    var hideMouse = options.hideMouse || false;
+    let isDisplay = options.isDisplay || false;
+    let doItemTransitions = options.doItemTransitions || false;
+    let hideMouse = options.hideMouse || false;
     // Now continue to initialisation
     if (!isDisplay) {
       document.body.classList.add('checkerboard');
@@ -1248,9 +1135,26 @@ var Display = {
    */
   setScale: function(scale) {
     document.body.style.zoom = scale+"%";
+  },
+  /**
+   * In order to check if a font exists, we need a container to do
+   * calculations on. This method creates that container and caches
+   * some width values so that we don't have to do this step every
+   * time we check if a font exists.
+   */
+  _prepareFontContainer: function() {
+    Display._fontContainer = document.createElement("span");
+    Display._fontContainer.id = "does-font-exist";
+    Display._fontContainer.innerHTML = Array(100).join("wi");
+    Display._fontContainer.style.cssText = [
+      "position: absolute",
+      "width: auto",
+      "font-size: 128px",
+      "left: -999999px"
+    ].join(" !important;");
+    document.body.appendChild(Display._fontContainer);
   }
 };
 new QWebChannel(qt.webChannelTransport, function (channel) {
-  window.mediaWatcher = channel.objects.mediaWatcher;
   window.displayWatcher = channel.objects.displayWatcher;
 });
diff --git a/openlp/core/display/webengine.py b/openlp/core/display/webengine.py
index c6dd8fcae..19bd9ec08 100644
--- a/openlp/core/display/webengine.py
+++ b/openlp/core/display/webengine.py
@@ -49,7 +49,8 @@ class WebEnginePage(QtWebEngineWidgets.QWebEnginePage):
         """
         # The JS log has the entire file location, which we don't really care about
         app_dir = AppLocation.get_directory(AppLocation.AppDir).parent
-        source_id = source_id.replace('file://{app_dir}/'.format(app_dir=app_dir), '')
+        if str(app_dir) in source_id:
+            source_id = source_id.replace('file://{app_dir}/'.format(app_dir=app_dir), '')
         # Log the JS messages to the Python logger
         log.log(LOG_LEVELS[level], '{source_id}:{line_number} {message}'.format(source_id=source_id,
                                                                                 line_number=line_number,
diff --git a/openlp/core/display/window.py b/openlp/core/display/window.py
index 3e2dfc218..ce1559af1 100644
--- a/openlp/core/display/window.py
+++ b/openlp/core/display/window.py
@@ -25,9 +25,11 @@ import json
 import logging
 import os
 import copy
+import re
 
 from PyQt5 import QtCore, QtWebChannel, QtWidgets
 
+from openlp.core.common import is_win
 from openlp.core.common.applocation import AppLocation
 from openlp.core.common.enum import ServiceItemType
 from openlp.core.common.i18n import translate
@@ -39,70 +41,10 @@ from openlp.core.display.screens import ScreenList
 from openlp.core.ui import HideMode
 
 
+FONT_FOUNDRY = re.compile(r'(.*?) \[(.*?)\]')
 log = logging.getLogger(__name__)
 
 
-class MediaWatcher(QtCore.QObject):
-    """
-    A class to watch media events in the display and emit signals for OpenLP
-    """
-    progress = QtCore.pyqtSignal(float)
-    duration = QtCore.pyqtSignal(float)
-    volume = QtCore.pyqtSignal(float)
-    playback_rate = QtCore.pyqtSignal(float)
-    ended = QtCore.pyqtSignal(bool)
-    muted = QtCore.pyqtSignal(bool)
-
-    @QtCore.pyqtSlot(float)
-    def update_progress(self, time):
-        """
-        Notify about the current position of the media
-        """
-        log.warning(time)
-        self.progress.emit(time)
-
-    @QtCore.pyqtSlot(float)
-    def update_duration(self, time):
-        """
-        Notify about the duration of the media
-        """
-        log.warning(time)
-        self.duration.emit(time)
-
-    @QtCore.pyqtSlot(float)
-    def update_volume(self, level):
-        """
-        Notify about the volume of the media
-        """
-        log.warning(level)
-        level = level * 100
-        self.volume.emit(level)
-
-    @QtCore.pyqtSlot(float)
-    def update_playback_rate(self, rate):
-        """
-        Notify about the playback rate of the media
-        """
-        log.warning(rate)
-        self.playback_rate.emit(rate)
-
-    @QtCore.pyqtSlot(bool)
-    def has_ended(self, is_ended):
-        """
-        Notify that the media has ended playing
-        """
-        log.warning(is_ended)
-        self.ended.emit(is_ended)
-
-    @QtCore.pyqtSlot(bool)
-    def has_muted(self, is_muted):
-        """
-        Notify that the media has been muted
-        """
-        log.warning(is_muted)
-        self.muted.emit(is_muted)
-
-
 class DisplayWatcher(QtCore.QObject):
     """
     This facilitates communication from the Display object in the browser back to the Python
@@ -153,14 +95,12 @@ class DisplayWindow(QtWidgets.QWidget, RegistryProperties, LogMixin):
         self.display_path = display_base_path / 'display.html'
         self.checkerboard_path = display_base_path / 'checkerboard.png'
         self.openlp_splash_screen_path = display_base_path / 'openlp-splash-screen.png'
-        self.set_url(QtCore.QUrl.fromLocalFile(path_to_str(self.display_path)))
         self.channel = QtWebChannel.QWebChannel(self)
-        self.media_watcher = MediaWatcher(self)
-        self.channel.registerObject('mediaWatcher', self.media_watcher)
         self.display_watcher = DisplayWatcher(self)
         self.channel.registerObject('displayWatcher', self.display_watcher)
         self.webview.page().setWebChannel(self.channel)
         self.display_watcher.initialised.connect(self.on_initialised)
+        self.set_url(QtCore.QUrl.fromLocalFile(path_to_str(self.display_path)))
         self.is_display = False
         self.scale = 1
         self.hide_mode = None
@@ -175,6 +115,19 @@ class DisplayWindow(QtWidgets.QWidget, RegistryProperties, LogMixin):
             if len(ScreenList()) > 1 or self.settings.value('core/display on monitor'):
                 self.show()
 
+    def _fix_font_name(self, font_name):
+        """
+        Do some font machinations to see if we can fix the font name
+        """
+        # Some fonts on Windows that end in "Bold" are made into a base font that is bold
+        if is_win() and font_name.endswith(' Bold'):
+            font_name = font_name.split(' Bold')[0]
+        # Some fonts may have the Foundry name in their name. Remove the foundry name
+        match = FONT_FOUNDRY.match(font_name)
+        if match:
+            font_name = match.group(1)
+        return font_name
+
     def deregister_display(self):
         """
         De-register this displays callbacks in the registry to be able to remove it
@@ -424,6 +377,9 @@ class DisplayWindow(QtWidgets.QWidget, RegistryProperties, LogMixin):
                 theme_copy.background_end_color = '#590909'
                 theme_copy.background_main_color = '#090909'
                 theme_copy.background_footer_color = '#090909'
+        # Do some font-checking, see https://gitlab.com/openlp/openlp/-/issues/39
+        theme_copy.font_main_name = self._fix_font_name(theme.font_main_name)
+        theme_copy.font_footer_name = self._fix_font_name(theme.font_footer_name)
         exported_theme = theme_copy.export_theme(is_js=True)
         self.run_javascript('Display.setTheme({theme});'.format(theme=exported_theme), is_sync=is_sync)
 
diff --git a/openlp/core/ui/thememanager.py b/openlp/core/ui/thememanager.py
index a1e31646a..eb0a956c8 100644
--- a/openlp/core/ui/thememanager.py
+++ b/openlp/core/ui/thememanager.py
@@ -199,9 +199,12 @@ class ThemeManager(QtWidgets.QWidget, RegistryBase, Ui_ThemeManager, LogMixin, R
 
         :rtype: None
         """
+        xml_file_paths = [p for p in AppLocation.get_section_data_path('themes').glob('*/*.xml')]
+        # Exit early if there are no themes to upgrade
+        if not xml_file_paths:
+            return
         # Wait for 2 seconds to allow some other things to start processing first
         wait_for(lambda: False, timeout=1)
-        xml_file_paths = AppLocation.get_section_data_path('themes').glob('*/*.xml')
         for xml_file_path in xml_file_paths:
             theme_data = get_text_file_string(xml_file_path)
             theme = self._create_theme_from_xml(theme_data, self.theme_path)
diff --git a/tests/functional/openlp_core/display/test_window.py b/tests/functional/openlp_core/display/test_window.py
index 82033aff8..137812440 100644
--- a/tests/functional/openlp_core/display/test_window.py
+++ b/tests/functional/openlp_core/display/test_window.py
@@ -32,7 +32,7 @@ from PyQt5 import QtCore
 # Mock QtWebEngineWidgets
 sys.modules['PyQt5.QtWebEngineWidgets'] = MagicMock()
 
-from openlp.core.display.window import DisplayWindow
+from openlp.core.display.window import DisplayWindow, DisplayWatcher
 from openlp.core.common.enum import ServiceItemType
 from openlp.core.lib.theme import Theme
 from openlp.core.ui import HideMode
@@ -220,6 +220,69 @@ def test_run_javascript_sync_no_wait(mock_time, mocked_webengine, mocked_addWidg
     mock_time.sleep.assert_not_called()
 
 
+@patch('openlp.core.display.window.QtWidgets.QVBoxLayout')
+@patch('openlp.core.display.webengine.WebEngineView')
+@patch('openlp.core.display.window.is_win')
+def test_fix_font_bold_windows(mocked_is_win, mocked_webengine, mocked_layout, mock_settings):
+    """
+    Test that on Windows, fonts that end with "Bold" are handled
+    """
+    # GIVEN: A display window and a font name
+    mocked_is_win.return_value = True
+    display_window = DisplayWindow()
+    display_window.is_display = True
+    display_window.run_javascript = MagicMock()
+    font_name = 'Arial Rounded MT Bold'
+
+    # WHEN: The font is processed
+    result = display_window._fix_font_name(font_name)
+
+    # Then the font name should be fixed
+    assert result == 'Arial Rounded MT'
+
+
+@patch('openlp.core.display.window.QtWidgets.QVBoxLayout')
+@patch('openlp.core.display.webengine.WebEngineView')
+@patch('openlp.core.display.window.is_win')
+def test_fix_font_bold_not_windows(mocked_is_win, mocked_webengine, mocked_layout, mock_settings):
+    """
+    Test that on NOT Windows, fonts that end with "Bold" are ignored
+    """
+    # GIVEN: A display window and a font name
+    mocked_is_win.return_value = False
+    display_window = DisplayWindow()
+    display_window.is_display = True
+    display_window.run_javascript = MagicMock()
+    font_name = 'Arial Rounded MT Bold'
+
+    # WHEN: The font is processed
+    result = display_window._fix_font_name(font_name)
+
+    # Then the font name should be fixed
+    assert result == 'Arial Rounded MT Bold'
+
+
+@patch('openlp.core.display.window.QtWidgets.QVBoxLayout')
+@patch('openlp.core.display.webengine.WebEngineView')
+@patch('openlp.core.display.window.is_win')
+def test_fix_font_foundry(mocked_is_win, mocked_webengine, mocked_layout, mock_settings):
+    """
+    Test that a font with a foundry name in it has the foundry removed
+    """
+    # GIVEN: A display window and a font name
+    mocked_is_win.return_value = False
+    display_window = DisplayWindow()
+    display_window.is_display = True
+    display_window.run_javascript = MagicMock()
+    font_name = 'CMG Sans [Foundry]'
+
+    # WHEN: The font is processed
+    result = display_window._fix_font_name(font_name)
+
+    # Then the font name should be fixed
+    assert result == 'CMG Sans'
+
+
 @patch('openlp.core.display.window.QtWidgets.QVBoxLayout')
 @patch('openlp.core.display.webengine.WebEngineView')
 def test_set_theme_is_display_video(mocked_webengine, mocked_addWidget, mock_settings, mock_geometry):
@@ -463,3 +526,18 @@ def test_hide_display_no_display(mocked_screenlist, mocked_webengine, mocked_add
 
     # THEN: Hide mode should still be none
     assert display_window.hide_mode is None
+
+
+def test_display_watcher_set_initialised():
+    """
+    Test that the initialised signal is emitted
+    """
+    # GIVEN: A DisplayWatcher instance
+    display_watcher = DisplayWatcher(None)
+
+    # WHEN: setInitialised is called
+    with patch.object(display_watcher, 'initialised') as mocked_initialised:
+        display_watcher.setInitialised(True)
+
+        # THEN: initialised should have been emitted
+        mocked_initialised.emit.assert_called_once_with(True)
diff --git a/tests/js/test_display.js b/tests/js/test_display.js
index 751fcf491..02fc7ee70 100644
--- a/tests/js/test_display.js
+++ b/tests/js/test_display.js
@@ -960,191 +960,3 @@ describe("Display.toggleVideoMute", function () {
     expect(mockVideo.muted).toEqual(false);
   });
 });
-
-describe("AudioPlayer", function () {
-  var audioPlayer, audioElement;
-
-  beforeEach(function () {
-    audioElement = {
-      _eventListeners: {},
-      _playing: false,
-      _paused: false,
-      _stopped: false,
-      src: "",
-      addEventListener: function (eventType, listener) {
-        this._eventListeners[eventType] = this._eventListeners[eventType] || [];
-        this._eventListeners[eventType].push(listener);
-      },
-      play: function () {
-        this._playing = true;
-        this._paused = false;
-        this._stopped = false;
-      },
-      pause: function () {
-        this._playing = false;
-        this._paused = true;
-        this._stopped = false;
-      }
-    };
-    spyOn(document, "createElement").and.returnValue(audioElement);
-    audioPlayer = new AudioPlayer();
-  });
-
-  it("should create an object", function () {
-    expect(audioPlayer).toBeDefined();
-    expect(audioPlayer._audioElement).not.toBeNull();
-    expect(audioPlayer._eventListeners).toEqual({});
-    expect(audioPlayer._playlist).toEqual([]);
-    expect(audioPlayer._currentTrack).toEqual(null);
-    expect(audioPlayer._canRepeat).toEqual(false);
-    expect(audioPlayer._state).toEqual(AudioState.Stopped);
-  });
-
-  it("should call the correct method when _callListener is called", function () {
-    var testCalled = false;
-    function test(event) {
-      testCalled = true;
-    }
-    audioPlayer._eventListeners["test"] = [test];
-    audioPlayer._callListener({"type": "test"});
-    expect(testCalled).toEqual(true);
-  });
-
-  it("should log a warning when _callListener is called for an unknown event", function () {
-    spyOn(console, "warn");
-    audioPlayer._callListener({"type": "test"});
-    expect(console.warn).toHaveBeenCalledWith("Received unknown event \"test\", doing nothing.");
-  });
-
-  it("should add all the correct event listeners", function () {
-    expectedListeners = {
-      "ended": [audioPlayer.onEnded, audioPlayer._callListener],
-      "timeupdate": [audioPlayer._callListener],
-      "volumechange": [audioPlayer._callListener],
-      "durationchange": [audioPlayer._callListener],
-      "loadeddata": [audioPlayer._callListener]
-    };
-    expect(audioElement._eventListeners).toEqual(expectedListeners);
-  });
-
-  it("should add the correct event listener when calling addEventListener", function () {
-    function dummy () {};
-    var expectedListeners = {
-      "test": [dummy]
-    };
-    audioPlayer.addEventListener("test", dummy);
-    expect(audioPlayer._eventListeners).toEqual(expectedListeners);
-  });
-
-  it("should set call nextTrack when the onEnded listener is called", function () {
-    spyOn(audioPlayer, "nextTrack");
-    audioPlayer.onEnded({});
-    expect(audioPlayer.nextTrack).toHaveBeenCalled();
-  });
-
-  it("should set the _canRepeat property when calling setCanRepeat", function () {
-    audioPlayer.setCanRepeat(true);
-    expect(audioPlayer._canRepeat).toEqual(true);
-  });
-
-  it("should clear the playlist when clearTracks is called", function () {
-    audioPlayer._playlist = ["one", "two", "three"];
-    audioPlayer.clearTracks();
-    expect(audioPlayer._playlist).toEqual([]);
-  });
-
-  it("should add a track to the playlist when addTrack is called", function () {
-    audioPlayer._playlist = [];
-    audioPlayer.addTrack("one");
-    expect(audioPlayer._playlist).toEqual(["one"]);
-  });
-
-  it("should move to the first track when canRepeat is true and nextTrack is called", function () {
-    spyOn(audioPlayer, "play");
-    audioPlayer.addTrack("one");
-    audioPlayer.addTrack("two");
-    audioPlayer.setCanRepeat(true);
-    audioPlayer._currentTrack = "two";
-
-    audioPlayer.nextTrack();
-
-    expect(audioPlayer.play).toHaveBeenCalledWith("one");
-  });
-
-  it("should move to the next track when nextTrack is called", function () {
-    spyOn(audioPlayer, "play");
-    audioPlayer.addTrack("one");
-    audioPlayer.addTrack("two");
-    audioPlayer._currentTrack = "one";
-
-    audioPlayer.nextTrack();
-
-    expect(audioPlayer.play).toHaveBeenCalledWith("two");
-  });
-
-  it("should stop when canRepeat is false and nextTrack is called on the last track in the list", function () {
-    spyOn(audioPlayer, "play");
-    spyOn(audioPlayer, "stop");
-    audioPlayer.addTrack("one");
-    audioPlayer.addTrack("two");
-    audioPlayer.setCanRepeat(false);
-    audioPlayer._currentTrack = "two";
-
-    audioPlayer.nextTrack();
-
-    expect(audioPlayer.play).not.toHaveBeenCalled();
-    expect(audioPlayer.stop).toHaveBeenCalled();
-  });
-
-  it("should play the first track when nextTrack is called when no songs are playing", function () {
-    spyOn(audioPlayer, "play");
-    audioPlayer.addTrack("one");
-    audioPlayer.nextTrack();
-    expect(audioPlayer.play).toHaveBeenCalledWith("one");
-  });
-
-  it("should log a warning when nextTrack is called when no songs are in the playlist", function () {
-    spyOn(console, "warn");
-    audioPlayer.nextTrack();
-    expect(console.warn).toHaveBeenCalledWith("No tracks in playlist, doing nothing.");
-  });
-
-  it("should play the track specified when play is called with a filename", function () {
-    audioPlayer.addTrack("one");
-    audioPlayer.play("one");
-
-    expect(audioPlayer._currentTrack).toEqual("one");
-    expect(audioElement._playing).toEqual(true);
-    expect(audioElement.src).toEqual("one");
-    expect(audioPlayer._state).toEqual(AudioState.Playing);
-  });
-
-  it("should continue playing when play is called without a filename and the player is paused", function () {
-    audioPlayer._state = AudioState.Paused;
-    audioPlayer.play();
-
-    expect(audioElement._playing).toEqual(true);
-    expect(audioPlayer._state).toEqual(AudioState.Playing);
-  });
-
-  it("should do nothing when play is called without a filename and the player is not paused", function () {
-    spyOn(console, "warn");
-    audioPlayer._state = AudioState.Playing;
-    audioPlayer.play();
-
-    expect(console.warn).toHaveBeenCalledWith("No track currently paused and no track specified, doing nothing.");
-  });
-
-  it("should pause the current track when pause is called", function () {
-    audioPlayer.pause();
-    expect(audioPlayer._state).toEqual(AudioState.Paused);
-    expect(audioElement._paused).toEqual(true);
-  });
-
-  it("should stop the current track when stop is called", function () {
-    audioPlayer.stop();
-    expect(audioPlayer._state).toEqual(AudioState.Stopped);
-    expect(audioElement._paused).toEqual(true);
-    expect(audioElement.src).toEqual("");
-  });
-});