After login, or a few minutes after login, my 17" macbook running 10.6.4 seems to just freeze up. The weird thing is, the whole computer works via keyboard, and the mouse CURSOR works, but when I highlight over items (i.e dock) nothing appears, and I can't click on anything. I can still use the keyboard, so I just hit the power button on my MBP and push enter to shut down and restart again, but everytime I login this freezing keeps occuring. It occurs either as soon as I log in, or several minutes after. Never in between, or never after that time. Any ideas anyone? Is this some kind of kernel panic? Will re-installing OSX and/or repairing the disc (disc utility) help this issue or do you think it's something worse?