jquery autocomplete - select list not showing?

jquery autocomplete - select list not showing?

Hey guys,

Prehistory:

i recently installed and set-up the jquery-autocomplete plugin from here: http://www.pengoworks.com/workshop/jquery/autocomplete.htm

I followed the instructions exactly and left the js-files and css-files of autocomplete untouched.

Now everything works fine, i can see that a selection list is rendered back to the client in the logfiles and i can see that jquery tries to display this selection list.

The problem:

The problem is, that the selection list on the client is not displayed or not displayed properly.

Live-Example:

Here is a live-example of the problem: http://www.addloops.com/tracks

If you click into the quick-search box and type in "mel" for example and then press the "down"-arrow on your keyboard it is autocompleted to "melancholic", which is exactly what i want.

You can also see that after typing in "mel" a very small box is displayed at the bottom of the quicksearch input box - so obviosly the functionality works as expected only the display itself is not working somehow.

Summary:

Unfortunately i don't have a clue what the problem is here?
A javascript-problem?
Or maybe a problem with the CSS?

I don't get any errors in the error-console.
Also, i tried out the original plugin from here: http://bassistance.de/jquery-plugins/jquery-plugin-autocomplete/

-> Same effect

The autocomplete-plugin works perfectly well on this example website: http://www.ajaxdaddy.com/demo-jquery-autocomplete.html

I just don't see any differences to my setup...

Any ideas on what is going wrong here?