| It's not something simple like you have a Control or Alt key stuck, is it?  I get that problem when I use a KVM box to switch from computer to computer, I have to unplug the keyboard and plug it back in. It could also be that your keyboard is going bad, I guess...   Check and see if the problem, or somthing similiar happens in other software... 
				__________________"Reality is just a crutch for people who can't cope with drugs."
 Robin Williams.
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