I Can't Watch DVDs Or Movies Full Screen

Hey all. I've had a read through a bunch of forums and no one seems to have had my problem. (At least, no one has posted about it that I can find).
I've had my Intel iMac for two months or so, and have always been able to watch full screen DVDs or .avi/.wmv/.mpg movies. However, in the past few days, whenever I go full screen (in any program; DVD Player, VLC, whatever) the playback becomes sketchy, the frame rate drops and everything gets jerky.
However, I can watch .wmv files fullscreen using Windows Media Player.
I haven't installed anything new recently. It just seems to have started happening for no good reason.
Any ideas would be much appreciated. It's not much fun watching DVDs or .avi's when they're not full screen. Thanks!

Thanks very much for the suggestions
My hard drive has about 130 gigs available, so I'm sure that's not it. I just repaired permissions and did a safe boot and the problem remains.
It's probably also worth noting that I've tried running both VLC and DVD Player after a reboot with absolutely no other programs running, so I don't think it's a memory problem.
I'm totally, 100% stumped.

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