I posted earlier with the same issue. Now I am going to add some data to help out.
SVN 31686 I had earlier had the same issue.
Win7 64bit
2 GB RAM
Integrated ATi x1200 using driver 10.6
HDMI ATI/Realtek driver 2.49
Current SVN xbmc-r31901-trunk.exe (debug log attached is for this version)
Skin: Confluence
NOTE: This only seems to affect items in Movies, not in TV Shows
Before when I posted I was able to get a movie to play by going into Videos and selecting the movie that way. If I went into Movies and see all the movie info and hit play it would either stick on Waiting... or it would start to play audio, no video, for about 10 seconds then freeze.
I had it working last night on SVN xbmc-r31755-trunk but that was after I deleted EVERYTHING that had to do with XBMC (userdata folder included) and installed 31755 fresh.
I decided to update to SVN xbmc-r31827-trunk by installing it on top of 31755 and that is when it broke again.
So I uninstalled 31827 and erased ALL userdata too then reinstalled 31827 and let it rescan all my Movie data (IMDB) while I slept. This morning it still wasn't working.
I didn't want to spend another 3.5 hours scraping movie info so I backed up sources.xml, MyVideos34.db, and the Thumbnails folder and uninstalled and deleted UserData.
I installed 31901 and restored the previously mentioned data so I wouldn't have to scrape again and the issue persists.
Full debug file is attached, and the steps followed in it are:
Start XBMC
Go to Videos > Movies directory > Title > 2 Fast 2 Furious > and the framerate drops to about 10 FPS and audio starts repeating the same second over and over again until the program hangs and Windows asks to close it or wait, which I choose close.
Let me know if you need any more info!
http://pastebin.com/C0yZSRfr