I am on the road, and trying to get some work done. But getting fast cycling desktop images, spinning pinwheel/beach ball and the dock is popping up and down. It all started yesterday after I updated win live messenger on one of my Windows VMs in Parallels. It hung the machine, so I forced a reboot with the power button. On the reboot, was when the issues started. I managed to get the system stable by zapping the PRAM. But this morning, when I went back into a VM, it started again. I have zapped the PRAM and still not working well. I boot up fine, but as soon as all toolbar icons are visible and the boot seems complete, I have the desktop images cycling ever 5 seconds (set to 15 minutes in preferences) and the dock appearing and disappearing on it's own. If I hover over bottom of screen, it does not show. I have tried to do basic work for awhile, but spinning pinwheel started up in a browser window. Now machine is hung up again I just installed the latest SL update 2.5 days ago. Does anyone have any thoughts?