I just got a brand new 21" iMac and am running lion. I am having trouble getting any flash based video to play. I have seen that some websites give you instructions that if your running a mac you should right click and uncheck the "enable hardware acceleration" box. I can right click and get that box to pop up but once I do for some reason I cannot click anything inside of it, whether it be the tabs or the check/uncheck box. Any help would be greatly appreciated.