Having issues with .ogm files

[Khorod]

Greetings,

I've been using MediaPortal for a while now and has been working wonderfull untill now.
I have had to reinstall Mediaportal today because of a system change and as far as i can tell have it set-up exactly the way it was (allthough newer versions of almost everything including mediaportal and ffdshow), however .OGM files are now either stuttering or not playing at all in Mediaportal while they work just fine in MPC or WMP.

I'm using the CCCP codec pack, but i've tried seperate installations of ffdshow, haali and vsfilter aswell and there is no difference.

I've added log files from playing a stuttering .ogm file aswell.

What could be the problem here?

MediaPortal Version: 1.0 RC1
MediaPortal Skin: Xface
Windows Version: Windows XP SP2
CPU Type: Intel Quadcore 2.4Ghz
Memory: 2GB
Motherboard: Asus P5B
Video Card: Nvidia 8800GTS
Video Card Driver: 6.14
MPEG2 Video Codec: MPV Decoder Filter
MPEG2 Audio Codec: ffdshow
h.264 Video Codec: ffdshow