Whatever browser I use: I can slide the volume just fine but it has no effect. If I put 50, 80, 0 or nothing in the volume field, it does not change anything: The clip always starts with 100% and is not adjustable.

<script type="text/javascript">
  // <![CDATA[
 jQuery(document).ready(
   function()
     {
       jQuery("#Mozart01").dmxHTML5VideoPlayer(
         {"width": 320, "height": 210, "playlist": [{"0": {"src": "media/LublinGP2.Satz.mp4", "type": "video/mp4"}, "2": {"src": "media/LublinGP2.Satz.ogv", "type": "video/ogg"}, "config": {"title": "Mozart Klavierkonzert, d-moll KV 466, 2.Satz (Ausschnitt)"}}], "volume": 80}
       );
     }
 );
  // ]]>
</script>

Hello,
Please provide a link to your page.

develop.babinsky.at/videos.html

Hello,
The following file is an old version and is most probably causing your issue:

<script type="text/javascript" src="ScriptLibrary/projekktor.min.js"></script>

Please delete it from the server and locally, and reapply the video player on your page (Just open its properties and click OK) so it can recreate the file. then manually upload the file to your server.

Thanks for the quick reply, I will do this rightaway.

Well, now i don't get rid of the "progress circle"

Internet Explorer 10 reacts even worse:

Seems to me like old design presets versions. Please remove the styles folder and reapply the video player again.

Tough - I had Nivoslider and Accordion styles also in the styles folder.
After I deleted them, I lost all my css modifications. Have to look for backups now...
Wouldn't it have been enough to delete the dmxHTML5VideoPlayer folder only?
On Firefox and Chrome everything works really well now, thanks!
However, the issue with Internet Explorer 10 has not changed: See picture above. Any idea?
As a web-designer IE fills my heart with grief. It is such a crappy piece of software, still widely used though, so we have to support it!