I'm posting this here instead of applications because it pertains to any random application, so is likely an OS problem. I tried a search but couldn't find anything that pertained directly to my problem.
Lately, I've been having a lot of problems with random applications hanging. I'll just be working, and one application will suddenly beachball on me, and won't ever recover. I can still move the mouse, and even drag windows around, but I can't change the window focus to a new window, log out, restart, or anything. Finally, I have to unplug the computer to reset it.
Does anyone have any ideas what could be causing this?