Hi guys! I have a very odd problem: My mac is working perfectly fine - apart from the fact that it will neither log out, restart or shut down via the apple-menu - only by holding down the power-button will it shut down. When I attempt to update via app-store, it all looks normal, asks me if I want to reboot now or later - I choose now - ...and nothing happens. At all. I simply cant update the OS. ALT-CMD-ESC doesn't work either. I've already tried repairing permissions via Disk Utility - no difference. It's a mid 2012 13" Macbook Air running 10.8 - I'm trying to update to 10.8.2. I've done a reinstall of 10.8 via a image-file, but to no avail. Same problem. It MIGHT have started during my tinkering with some settings in Onyx -(http://www.macupdate.com/app/mac/11582/onyx) but I can't say for sure. ... But the problem is still here even after reinstalling the OS. Any suggestions apart from bringing it in to Apple or doing a complete CLEAN install of 10.8? Any advice would be greatly appreciated!