Brashley, I think arthur posted here how to get the debug from "atabake" which is the component responsible for the media playback handling to (mplayer or maemo media player) can you do that? :

Menu > Utilities > X Terminal

$> atabake stop
$> atabake start -vvvvvv --logfile=log.txt
$> atabake

It should fail at this point as you related. Now, put an MMC or SD
card on the device and:

$> cp log.txt /media/mmc1

Then you just have to email us the file log.txt

Thanks.