I have had this annoying problem for some time now. what happens is, sometimes when I switch spaces (cmd+arrow), the spaces boxes in middle of the screen do not fade away and I cannot use my keyboard to do anything except change spaces and use the F buttons at the top. my current remedy to resolve this issue is to roll my hand/face across the keyboard and hope for it to go away (which eventually does based on luck) so I am guessing there must be some sort of hotkey for it. so please, if anyone knows what I am talking about or has a solution please let me know (not using spaces is not an option for me). Thanks.