After updating Mezzmo to version 2.6.4.0 my Philips 7605 TV will no longer play most formats.

I've been using a customized version of the Philips 7000 profile that has been playing mkv, mp4, avi and wmv files without any trouble, but after the update the only thing that will play is wmv. Switching back to the standard 7000 profile doesn't make any difference. Anything other than wmv just gives an 'unsupported format' message on the TV.

By digging around in other profiles, I've managed to fix the avi and mp4 formats by changing the mimetypes to video/x-msvideo from video/avi and video/mp4v from video/mp4, but I can't seem to find the magic word that will make it play the mkv files again.

Have you got any hints as to what I need to change to make it play mkv files again?