Ive not come across this before, I can be just surfing the net, or watching Eye Tv, and then i'll go to check my mail, or click onto msn, or ichat or anything on my dock, and it doesnt work, itts like theres nothing there for it to click on, but the icons are there, if i click on an icon, and hold it, to bring up the options normally there, that doesnt work either, ive got hot corners set up, sometimes they work when this happens, sometimes they dont, clicking on the in the top left works, but is really slow. So whats different - Nothing, new new accounts, no new software, no apple updates. It takes a hard switch off to turn the mac off, and then everything is fine again, Ive repaired disk permissions, still happens. What could be wrong with my iMac? Ive not searched for this because to be honest ive no idea how to explain it. Edit - Just had to update msn for mac, its way quicker for me to log onto msn. Ill see if it still happens.