diff --git a/package.json b/package.json
index acb85d2a..130935af 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "genoverse",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "description": "Genoverse is a portable, customizable, back-end independent JavaScript and HTML5 based genome browser which allows the user to explore data in a dynamic and interactive manner.",
   "main": "src/js/Genoverse.js",
   "directories": {
diff --git a/src/js/Genoverse.js b/src/js/Genoverse.js
index f57b6ddb..c3f1922c 100644
--- a/src/js/Genoverse.js
+++ b/src/js/Genoverse.js
@@ -146,17 +146,20 @@ const Genoverse = Base.extend({
       this.loadedPlugins[plugin.name] = true;
     };
 
-    const pluginImports = Object.keys(pluginsByName).map(pluginName => import(`./plugins/${pluginName}`).then(
-      (imported) => {
-        initializePlugin({
-          name    : pluginName,
-          conf    : pluginsByName[pluginName].conf,
-          exports : imported.default,
-        });
-      }
-    ));
+    const pluginImports = Object.keys(pluginsByName).reduce(
+      (ready, pluginName) => ready.then(
+        () => import(`./plugins/${pluginName}`).then(
+          imported => initializePlugin({
+            name    : pluginName,
+            conf    : pluginsByName[pluginName].conf,
+            exports : imported.default,
+          })
+        )
+      ),
+      this.jQuery.Deferred().resolve()
+    );
 
-    return this.jQuery.when(...pluginImports);
+    return this.jQuery.when(pluginImports);
   },
 
   init: function () {
@@ -543,7 +546,7 @@ const Genoverse = Base.extend({
   onTracks: function (func, ...args) {
     this.tracks.forEach(
       (track) => {
-        if (track.disabled) {
+        if (track.disabled || !track._interface) { // if track._interface is undefined, the track has not been fully initialized yet
           return;
         }
 
diff --git a/src/js/plugins/focusRegion.js b/src/js/plugins/focusRegion.js
index 16af5812..b61308d2 100644
--- a/src/js/plugins/focusRegion.js
+++ b/src/js/plugins/focusRegion.js
@@ -1,13 +1,13 @@
-import './controlPanel';
+import controlPanel from './controlPanel';
 
 const plugin = function () {
   this.controls.push({
-    icon    : '<i class="fas fa-map-marker-alt"></i>',
-    'class' : 'gv-button-large',
-    name    : `Reset focus to ${this.focusRegion && this.focusRegion.name ? this.focusRegion.name : `${this.chr}:${this.start}-${this.end}`}`,
-    action  : (browser) => { browser.moveTo(browser.focusRegion.chr, browser.focusRegion.start, browser.focusRegion.end, true); },
-    init    : (browser) => { browser.focusRegion = browser.focusRegion || { chr: browser.chr, start: browser.start, end: browser.end }; },
+    icon   : '<i class="fas fa-map-marker-alt"></i>',
+    class  : 'gv-button-large',
+    name   : `Reset focus to ${this.focusRegion && this.focusRegion.name ? this.focusRegion.name : `${this.chr}:${this.start}-${this.end}`}`,
+    action : (browser) => { browser.moveTo(browser.focusRegion.chr, browser.focusRegion.start, browser.focusRegion.end, true); },
+    init   : (browser) => { browser.focusRegion = browser.focusRegion || { chr: browser.chr, start: browser.start, end: browser.end }; },
   });
 };
 
-export default { focusRegion: plugin };
+export default { focusRegion: plugin, requires: controlPanel };