I don't watch movies much on my DX, but just noticed this issue. When I watch the same video on my iMac, it plays fine. When I watch it on my DX, the audio and video are out of sync. At first I thought it may be because I was underclocked, so I bumped that up - didn't help. I do have the following mods installed: Liberty Battery Saver, Liberty Anti-Reboot / Freeze Fix, Sysctl settings applied. Any ideas?