I'm using a 2009 mini as my home theater PC, and thus far it had run pretty much flawlessly. However, I tried playing some fansubs for the first time with Snow Leopard today, and I couldn't seem to get anything working properly. Wondering if anybody else is having similar problems or has any suggestions. This is on 10.6.1, 4GB RAM, 1920x1080 video output, and nothing else running; videos were medium-definition h264 MKVs with soft subtitles. SL is running everything it can in 64bit, but I haven't done anything crazy like try to boot the 64bit kernel (or, really, anything at all past a stock install). First tried VLC. It simply stalled at the barber-pole progress bar where it would usually be pre-scanning the video or whatever it does when you first open one. Tried a few different videos, including ones I know played fine before, same behavior on all of them. VLC 1.0.1. Next I tried QT Player 7 with the latest 1.1.4 Perian installed. It opened the video fine, but playing fullscreen was dropping frames all over the place, to the point it was basically unwatchable. So then in desperation I went to Plex; this, finally, played the video properly. But it also was suffering from rather severe tearing, which I don't remember being an issue with it in the past (in fact, after either 10.4 or 10.5--forget which it was that added coalesced frames to the entire OS--I haven't seen tearing anywhere). Did 10.6 goof up something in the video subsystem that Perian and Plex rely on to cause this, or is there just something weird with my system? Anybody else having any of these problems?