I run Leopard (10.5.8) on a Unibody Macbook (collector's edition ). Today, I experienced a wierd hang when I unlocked the screen on my Macbook. See the attached picture. The screensaver cleared and I could see my desktop and applications, but the unlock screen dialog didn't go away, all buttons were disabled and clicking on the desktop or on Firefox had no effect. The mouse moved around the screen just fine, but nothing happened no matter wherever I clicked, and there was no movement of the dock or anything. No combinations of keypresses made any difference. Finally I had to force shutdown of my Mac by holding the power button. Any ideas what could be wrong? Is there any way I can send this hang to Apple? I actually have another computer (a PC) in the house, so in hindsight I should have tried to SSH into my Mac and tried killing some processes to see if I could get it back. I didn't think of it at the time this happened.