I've noticed that MC has problems playing back some x264 encoded vids. I use a program called StaxRip which is a great all-in-one encoding app with a GUI (no command line fiddling) but the only way i can get the movies to play in MC is to use the iPod profile, which doesnt analyse the video very well and the quality ends up terrible.
I have the kLite codec pack installed and can play back just about any other file. The vids in question plack back fine in MediaPlayerClassic
Is there an updated x264 dll I can download? or do you think it's a prob on my end?