I've noticed sometimes when I get problems like listed earlier this day (finicky CD/DVD ejecting & unmounting permissions), I get jerky motion when I finally am able to play something like an .avi off the mounted disc. I can stop Kaffiene and even pkill it, but it still continues. The problem stops if I reboot and run the .avi off the cd/dvd again.
Any idea what's going on in the background here? Is there another process I have to kill, or do I simply have to wait a long time before jerkiness doesn't become an issue? Or is reboot the only solution?