hey all, i was just hiding all of my apps before i put my mbp to sleep. and i only have ichat, safari, and the finder open (obviously). and i could only hide one of the 2 (ichat or safari) when i try to hide the other, i hear that annoying beep alert sound that pretty much says i cant hide it. why is that? i used to be able to hide all my apps, no matter how many i had open. anyway to get past this? in a setting or something? thanks!