Audio continieus but the "picture" just stands still

Hello everybody, I have the following problem.

I have installed Ace mega codec pack and Media player 9RC

Until recently everything worked, but now new released movies like SWAT give me problems. They begin playing and after betweem 5 and 12 seconds play time they just stop. Audio continieus but the “picture” just stands still on where the movie had stopped playing.

Anyone got any advice?
Thanks