diff --git a/bazarr/get_languages.py b/bazarr/get_languages.py
index c76ddefc7..6d8b96182 100644
--- a/bazarr/get_languages.py
+++ b/bazarr/get_languages.py
@@ -5,6 +5,7 @@ import sqlite3
 import pycountry
 
 from get_args import args
+from subzero.language import Language
 
 
 def load_language_in_db():
@@ -108,5 +109,21 @@ def alpha3_from_language(lang):
     return result
 
 
+def get_language_set():
+    db = sqlite3.connect(os.path.join(args.config_dir, 'db', 'bazarr.db'), timeout=30)
+    c = db.cursor()
+    languages = c.execute('''SELECT code3 FROM table_settings_languages WHERE enabled = 1''').fetchall()
+    db.close()
+    language_set = set()
+
+    for lang in languages:
+        if lang[0] == 'pob':
+            language_set.add(Language('por', 'BR'))
+        else:
+            language_set.add(Language(lang[0]))
+
+    return language_set
+
+
 if __name__ == '__main__':
     load_language_in_db()
diff --git a/bazarr/list_subtitles.py b/bazarr/list_subtitles.py
index f4bcdc23e..6a803e0df 100644
--- a/bazarr/list_subtitles.py
+++ b/bazarr/list_subtitles.py
@@ -16,7 +16,7 @@ from bs4 import UnicodeDammit
 from itertools import islice
 
 from get_args import args
-from get_languages import alpha2_from_alpha3
+from get_languages import alpha2_from_alpha3, get_language_set
 from config import settings
 from helper import path_replace, path_replace_movie, path_replace_reverse, \
     path_replace_reverse_movie
@@ -56,7 +56,8 @@ def store_subtitles(file):
         try:
             # fixme: set subliminal_patch.core.CUSTOM_PATHS to a list of absolute folders or subfolders to support
             #   subtitles outside the media file folder
-            subtitles = search_external_subtitles(file)
+            subtitles = search_external_subtitles(file, languages=get_language_set(),
+                                                  only_one=settings.general.getboolean('single_language'))
         except Exception as e:
             logging.exception("BAZARR unable to index external subtitles.")
             pass
@@ -137,10 +138,10 @@ def store_subtitles_movie(file):
         
         # fixme: set subliminal_patch.core.CUSTOM_PATHS to a list of absolute folders or subfolders to support
         #   subtitles outside the media file folder
-        subtitles = search_external_subtitles(file)
         brazilian_portuguese = [".pt-br", ".pob", "pb"]
         try:
-            subtitles = core.search_external_subtitles(file)
+            subtitles = search_external_subtitles(file, languages=get_language_set(),
+                                                  only_one=settings.general.getboolean('single_language'))
         except Exception as e:
             logging.exception("BAZARR unable to index external subtitles.")
             pass
diff --git a/libs/subliminal_patch/core.py b/libs/subliminal_patch/core.py
index e46ff617d..d4c159a1c 100644
--- a/libs/subliminal_patch/core.py
+++ b/libs/subliminal_patch/core.py
@@ -600,7 +600,7 @@ def _search_external_subtitles(path, languages=None, only_one=False, scandir_gen
                 logger.error('Cannot parse language code %r', language_code)
                 language = None
 
-        if not language and only_one:
+        elif not language_code and only_one:
             language = Language.rebuild(list(languages)[0], forced=forced)
 
         subtitles[p] = language
diff --git a/views/episodes.tpl b/views/episodes.tpl
index d129b5edd..586e36dec 100644
--- a/views/episodes.tpl
+++ b/views/episodes.tpl
@@ -361,8 +361,11 @@
 	});
 
 	$('#search_missing_subtitles').on('click', function(){
-		$('#loader_text').text("Searching for missing subtitles...");
-		window.location = '{{base_url}}search_missing_subtitles/{{no}}';
+		$(this).addClass('disabled');
+		$(this).find('i:first').addClass('loading');
+	    $.ajax({
+            url: '{{base_url}}search_missing_subtitles/{{no}}'
+        })
 	});
 
 	$('.remove_subtitles').on('click', function(){
@@ -418,7 +421,7 @@
 		});
 	});
 
-	$('a:not(.manual_search), .menu .item, button:not(#config, .cancel)').on('click', function(){
+	$('a:not(.manual_search), .menu .item, button:not(#config, .cancel, #search_missing_subtitles)').on('click', function(){
 		$('#loader').addClass('active');
 	});
 
diff --git a/views/menu.tpl b/views/menu.tpl
index 10b6bec2b..9bea9b648 100644
--- a/views/menu.tpl
+++ b/views/menu.tpl
@@ -19,6 +19,8 @@
 			.searchicon {
 				color: white !important;
 			}
+            div.disabled { pointer-events: none; }
+            button.disabled { pointer-events: none; }
         </style>
     </head>
     <body>
@@ -222,13 +224,13 @@
 </script>
 
 <script type="text/javascript">
-	var url = location.protocol +"//" + window.location.host + "{{base_url}}notifications";
-	var notification;
+	var url_notifications = location.protocol +"//" + window.location.host + "{{base_url}}notifications";
+	var notificationTimeout;
 	var timeout;
 	var killer;
-	function doAjax() {
+	function doNotificationsAjax() {
         $.ajax({
-            url: url,
+            url: url_notifications,
             success: function (data) {
             	if (data !== "") {
 					data = JSON.parse(data);
@@ -275,17 +277,79 @@
             },
             complete: function (data) {
                 // Schedule the next
-                if (data != "") {
-                	notification = setTimeout(doAjax, 100);
+                if (data !== "") {
+                	notificationTimeout = setTimeout(doNotificationsAjax, 100);
 				} else {
-                	notification = setTimeout(doAjax, 1000);
+                	notificationTimeout = setTimeout(doNotificationsAjax, 1000);
 				}
             }
         });
     }
-    notification = setTimeout(doAjax, 1000);
+    notificationTimeout = setTimeout(doNotificationsAjax, 1000);
 
 	$(window).bind('beforeunload', function(){
-		clearTimeout(notification);
+		clearTimeout(notificationTimeout);
+	});
+</script>
+
+
+<script type="text/javascript">
+	var url_tasks = location.protocol +"//" + window.location.host + "{{base_url}}running_tasks";
+	var tasksTimeout;
+	function doTasksAjax() {
+        $.ajax({
+            url: url_tasks,
+            dataType: 'json',
+            success: function (data) {
+            	$('#tasks > tbody  > tr').each(function() {
+					if ($.inArray($(this).attr('id'), data['tasks']) > -1) {
+					    $(this).find('td:last').find('div:first').addClass('disabled');
+						$(this).find('td:last').find('div:first').find('i:first').addClass('loading');
+					} else {
+						$(this).find('td:last').find('div:first').removeClass('disabled');
+						$(this).find('td:last').find('div:first').find('i:first').removeClass('loading');
+					}
+				});
+
+            	if ($.inArray('wanted_search_missing_subtitles', data['tasks']) > -1) {
+                    $('#wanted_search_missing_subtitles').addClass('disabled');
+                    $('#wanted_search_missing_subtitles_movies').addClass('disabled');
+                    $('#wanted_search_missing_subtitles').find('i:first').addClass('loading');
+                    $('#wanted_search_missing_subtitles_movies').find('i:first').addClass('loading');
+                } else {
+                    $('#wanted_search_missing_subtitles').removeClass('disabled');
+                    $('#wanted_search_missing_subtitles_movies').removeClass('disabled');
+                    $('#wanted_search_missing_subtitles').find('i:first').removeClass('loading');
+                    $('#wanted_search_missing_subtitles_movies').find('i:first').removeClass('loading');
+                }
+
+                %if 'no' in locals():
+            	if ($.inArray('search_missing_subtitles_{{no}}', data['tasks']) > -1) {
+                    $('#search_missing_subtitles').addClass('disabled');
+                    $('#search_missing_subtitles').find('i:first').addClass('loading');
+                } else {
+                    $('#search_missing_subtitles').removeClass('disabled');
+                    $('#search_missing_subtitles').find('i:first').removeClass('loading');
+                }
+
+            	if ($.inArray('search_missing_subtitles_movie_{{no}}', data['tasks']) > -1) {
+                    $('#search_missing_subtitles_movie').addClass('disabled');
+                    $('#search_missing_subtitles_movie').find('i:first').addClass('loading');
+                } else {
+                    $('#search_missing_subtitles_movie').removeClass('disabled');
+                    $('#search_missing_subtitles_movie').find('i:first').removeClass('loading');
+                }
+            	%end
+            },
+            complete: function (data) {
+                // Schedule the next
+                tasksTimeout = setTimeout(doTasksAjax, 5000);
+            }
+        });
+    }
+    tasksTimeout = setTimeout(doTasksAjax, 500);
+
+	$(window).bind('beforeunload', function(){
+		clearTimeout(tasksTimeout);
 	});
 </script>
\ No newline at end of file
diff --git a/views/movie.tpl b/views/movie.tpl
index f43ef0a0b..8f6b96664 100644
--- a/views/movie.tpl
+++ b/views/movie.tpl
@@ -94,7 +94,7 @@
 				<img class="left floated ui image" style="max-height:250px;" src="{{base_url}}image_proxy_movies{{details[2]}}">
 				<div class="ui right floated basic icon buttons">
 					<button id="scan_disk" class="ui button" data-tooltip="Scan disk for subtitles" data-inverted=""><i class="ui inverted large compact refresh icon"></i></button>
-					<button id="search_missing_subtitles" class="ui button" data-tooltip="Download missing subtitles" data-inverted=""><i class="ui inverted huge compact search icon"></i></button>
+					<button id="search_missing_subtitles_movie" class="ui button" data-tooltip="Download missing subtitles" data-inverted=""><i class="ui inverted huge compact search icon"></i></button>
 					<%
 					subs_languages = ast.literal_eval(str(details[7]))
 					subs_languages_list = []
@@ -314,9 +314,12 @@
 		window.location = '{{base_url}}scan_disk_movie/{{no}}';
 	});
 
-	$('#search_missing_subtitles').on('click', function(){
-		$('#loader_text').text("Searching for missing subtitles...");
-		window.location = '{{base_url}}search_missing_subtitles_movie/{{no}}';
+	$('#search_missing_subtitles_movie').on('click', function(){
+		$(this).addClass('disabled');
+		$(this).find('i:first').addClass('loading');
+	    $.ajax({
+            url: '{{base_url}}search_missing_subtitles_movie/{{no}}'
+        })
 	});
 
 	$('.remove_subtitles').on('click', function(){
@@ -371,7 +374,7 @@
 		});
 	});
 
-	$('a, .menu .item, button:not(#config, .cancel, .manual_search)').on('click', function(){
+	$('a, .menu .item, button:not(#config, .cancel, .manual_search, #search_missing_subtitles_movie)').on('click', function(){
 		$('#loader').addClass('active');
 	});
 
diff --git a/views/system.tpl b/views/system.tpl
index 40c9482d2..c53716bb5 100644
--- a/views/system.tpl
+++ b/views/system.tpl
@@ -62,7 +62,7 @@
 			</div>
 			<div class="ui bottom attached tab segment active" data-tab="tasks">
 				<div class="content">
-					<table class="ui very basic selectable table">
+					<table class="ui very basic selectable table" id="tasks">
 						<thead>
 							<tr>
 								<th>Name</th>
@@ -73,7 +73,7 @@
 						</thead>
 						<tbody>
 						%for task in task_list:
-							<tr>
+							<tr id="{{task[3]}}">
 								<td>{{task[0]}}</td>
 								<td>{{task[1]}}</td>
 								<td>{{task[2]}}</td>
@@ -346,7 +346,11 @@
 	});
 
 	$('.execute').on('click', function(){
-		window.location = '{{base_url}}execute/' + $(this).data("taskid");
+	    $(this).addClass('disabled');
+		$(this).find('i:first').addClass('loading');
+	    $.ajax({
+            url: '{{base_url}}execute/' + $(this).data("taskid")
+        })
 	});
 
 	$('a:not(.tabs), button:not(.cancel, #download_log), #restart').on('click', function(){
diff --git a/views/wantedmovies.tpl b/views/wantedmovies.tpl
index df87d8edd..1b2140068 100644
--- a/views/wantedmovies.tpl
+++ b/views/wantedmovies.tpl
@@ -139,7 +139,7 @@
 
 
 <script>
-	$('a, button').on('click', function(){
+	$('a, button:not(#wanted_search_missing_subtitles_movies)').on('click', function(){
 		$('#loader').addClass('active');
 	});
 
@@ -157,8 +157,11 @@
 	});
 
 	$('#wanted_search_missing_subtitles_movies').on('click', function(){
-		$('#loader_text').text("Searching for missing subtitles...");
-		window.location = '{{base_url}}wanted_search_missing_subtitles';
+		$(this).addClass('disabled');
+		$(this).find('i:first').addClass('loading');
+	    $.ajax({
+            url: '{{base_url}}wanted_search_missing_subtitles'
+        })
 	});
 
 	$('.get_subtitle').on('click', function(){
diff --git a/views/wantedseries.tpl b/views/wantedseries.tpl
index d1dac768c..db859917f 100644
--- a/views/wantedseries.tpl
+++ b/views/wantedseries.tpl
@@ -146,7 +146,7 @@
 
 
 <script>
-	$('a, button').on('click', function(){
+	$('a, button:not(#wanted_search_missing_subtitles)').on('click', function(){
 		$('#loader').addClass('active');
 	});
 
@@ -164,8 +164,11 @@
 	});
 
 	$('#wanted_search_missing_subtitles').on('click', function(){
-		$('#loader_text').text("Searching for missing subtitles...");
-		window.location = '{{base_url}}wanted_search_missing_subtitles';
+		$(this).addClass('disabled');
+		$(this).find('i:first').addClass('loading');
+	    $.ajax({
+            url: '{{base_url}}wanted_search_missing_subtitles'
+        })
 	});
 
 	$('.get_subtitle').on('click', function(){