diff --git a/airtime_mvc/application/controllers/AudiopreviewController.php b/airtime_mvc/application/controllers/AudiopreviewController.php
index bd7505595..3718a86a0 100644
--- a/airtime_mvc/application/controllers/AudiopreviewController.php
+++ b/airtime_mvc/application/controllers/AudiopreviewController.php
@@ -278,6 +278,7 @@ class AudiopreviewController extends Zend_Controller_Action
                 'element_artist' => isset($track['creator']) ? $track['creator'] : "",
                 'element_position' => $position,
                 'element_id' => ++$position,
+                'mime' => isset($track['mime'])?$track['mime']:""
             );
 
             $elementMap['type'] = $track['type'];
diff --git a/airtime_mvc/application/models/PlayoutHistory.php b/airtime_mvc/application/models/PlayoutHistory.php
index ba845fa33..7da1ff2c2 100644
--- a/airtime_mvc/application/models/PlayoutHistory.php
+++ b/airtime_mvc/application/models/PlayoutHistory.php
@@ -16,12 +16,12 @@ class Application_Model_PlayoutHistory
     private $opts;
 
     private $mDataPropMap = array(
-        "artist"    => "file.artist_name",
-        "title"     => "file.track_title",
-        "played"    => "playout.played",
-        "length"    => "file.length",
-        "composer"  => "file.composer",
-        "copyright" => "file.copyright",
+        "artist"    => "artist_name",
+        "title"     => "track_title",
+        "played"    => "played",
+        "length"    => "length",
+        "composer"  => "composer",
+        "copyright" => "copyright",
     );
 
     public function __construct($p_startDT, $p_endDT, $p_opts)
diff --git a/airtime_mvc/application/models/ShowInstance.php b/airtime_mvc/application/models/ShowInstance.php
index b08a0e37c..6a513aac4 100644
--- a/airtime_mvc/application/models/ShowInstance.php
+++ b/airtime_mvc/application/models/ShowInstance.php
@@ -677,7 +677,8 @@ FROM (
                 f.length AS length,
                 f.artist_name AS creator,
                 f.file_exists AS EXISTS,
-                f.filepath AS filepath
+                f.filepath AS filepath,
+                f.mime AS mime
          FROM cc_schedule AS s
          LEFT JOIN cc_files AS f ON f.id = s.file_id
          WHERE s.instance_id = :instance_id1
@@ -693,7 +694,8 @@ FROM (
                 ws.length AS length,
                 sub.login AS creator,
                 't'::boolean AS EXISTS,
-                ws.url AS filepath
+                ws.url AS filepath,
+                ws.mime as mime
          FROM cc_schedule AS s
          LEFT JOIN cc_webstream AS ws ON ws.id = s.stream_id
          LEFT JOIN cc_subjs AS sub ON ws.creator_id = sub.id
diff --git a/airtime_mvc/public/js/airtime/audiopreview/preview_jplayer.js b/airtime_mvc/public/js/airtime/audiopreview/preview_jplayer.js
index 0f5a0b0fe..e7435ee2e 100644
--- a/airtime_mvc/public/js/airtime/audiopreview/preview_jplayer.js
+++ b/airtime_mvc/public/js/airtime/audiopreview/preview_jplayer.js
@@ -123,6 +123,7 @@ function buildplaylist(p_url, p_playIndex) {
         var media;
         var index;
         var total = 0;
+        var skipped = 0;
         for(index in data) {
             if (data[index]['type'] == 0) { 
                 if (data[index]['element_mp3'] != undefined){
@@ -145,22 +146,30 @@ function buildplaylist(p_url, p_playIndex) {
                             artist: data[index]['element_artist'],
                             wav:data[index]['uri']
                     };
-                }  
+                } else {
+                    // skip this track since it's not supported
+                    console.log("continue");
+                    skipped++;
+                    continue;
+                } 
             } else if (data[index]['type'] == 1) {
                  media = {title: data[index]['element_title'],
                         artist: data[index]['element_artist'],
                         mp3:data[index]['uri']
                 };
             }
+            console.log(data[index]);
             if (media && isAudioSupported(data[index]['mime'])) {
-                myPlaylist[index] = media;
+                // javascript doesn't support associative array with numeric key
+                // so we need to remove the gap if we skip any of tracks due to
+                // browser incompatibility.
+                myPlaylist[index-skipped] = media;
             }
             // we should create a map according to the new position in the
             // player itself total is the index on the player
             _idToPostionLookUp[data[index]['element_id']] = total;
             total++;
         }
-        
         _playlist_jplayer.setPlaylist(myPlaylist);
         _playlist_jplayer.option("autoPlay", true);
         play(p_playIndex);
diff --git a/airtime_mvc/public/js/airtime/library/spl.js b/airtime_mvc/public/js/airtime/library/spl.js
index a5937820d..5e300dea6 100644
--- a/airtime_mvc/public/js/airtime/library/spl.js
+++ b/airtime_mvc/public/js/airtime/library/spl.js
@@ -366,7 +366,7 @@ var AIRTIME = (function(AIRTIME){
     //and verify whether they can be previewed by the browser or not. If not
     //then the playlist element is greyed out
     mod.validatePlaylistElements = function(){
-        $.each($(".big_play ui-icon-play"), function(index, value){
+        $.each($("div .big_play"), function(index, value){
             if ($(value).attr('blockId') === undefined) {
                 var mime = $(value).attr("data-mime-type");
                 if (isAudioSupported(mime)) {
diff --git a/python_apps/pypo/pypopush.py b/python_apps/pypo/pypopush.py
index aaacc1687..87e1704bf 100644
--- a/python_apps/pypo/pypopush.py
+++ b/python_apps/pypo/pypopush.py
@@ -399,7 +399,15 @@ class PypoPush(Thread):
 
 
     def date_interval_to_seconds(self, interval):
-        return (interval.microseconds + (interval.seconds + interval.days * 24 * 3600) * 10 ** 6) / float(10 ** 6)
+        """
+        Convert timedelta object into int representing the number of seconds. If
+        number of seconds is less than 0, then return 0.
+        """
+        seconds = (interval.microseconds + \
+                   (interval.seconds + interval.days * 24 * 3600) * 10 ** 6) / float(10 ** 6)
+        if seconds < 0: seconds = 0
+
+        return seconds
 
     def push_to_liquidsoap(self, event_chain):