Just recently in the past 2 days I have been having some strange problems with OSX. Suddenly and without warning at times the Finder disappears and goes to a blue screen. Twice it took me back to the logon screen and just recently it went back to just a blue screen and sat there with the ball spinning. Also, applications have started screwing up such as Safari where they will just quit out for no reason and others just won't start up. This has all just started happening recently. Has anyone else had these problems? Does anyone have any suggestions for how to fix these problems? Thanks.