No video playback

[Derfo]

Hi, I have recently installed GBPVR, and everything works splendidly except for one thing: I can't seem to playback recorded videos. When I playback the recorded video through gbpvr, it just stopps and returns me to the previous menu. However, if I hook up an monitor and play it there is works (nothing wrong with the file). I can record to a directory using gbpvr and play it in MCE 2005, but I rather use gbpvr for video playback as well.
Live TV works without problems, and so does music playback.
Is there a setting I have forgotten? A bug?

Relevant hardware:
TV Card: Sapphire Theatrix 550 (Cable in)
Video card: Leadtek 6600GT (TV out to tv)
OS: Windows XP Media Center 2005

Thanks!
/derfo

[reven]

have you got a mpeg2 decoder installed? eg windvd, powerdvd etc

[Derfo]

Thanks for the feedback.
I have the NVIDIA DVD Decoder v1.00.67 installed, but no DVD player as such.