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I am using a Mac with external Windows keyboard which has two Windows keys, on the left and on the right. Something went weird after last OS update. Now, I can only use right Windows key to do copy/paste, left Windows key still works for things like opening new tabs in the browser but does not respond to copy/paste. I am a relative Mac newbie, not sure how to go about bring the left key back to life. Any help would be much appreciated.

Thank you

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Have you tried another keyboard to see if the behavior is the same? –  Daniel Beck Dec 19 '10 at 17:09
No, I have not. After some searching I found that I could remap the keys using "Modifier keys". I was able to get the keyboard to work using "Windows" shortcuts, which kind of solves the problem for me, does not answer why Windows key stopped working though. –  Alex Dec 19 '10 at 17:19
Re-remap your keys and try software such as Mousepose (shareware) that is capable of displaying what keys you press. Does it show Cmd-C pressed, or not? Do you have additional software running, e.g. on autostart? Something like an application launcher? Maybe a weird shortcut defined for a service (System Preferences, Keyboard, Keyboard Shortcuts, Services)? –  Daniel Beck Dec 20 '10 at 21:22

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