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Early 2011 15" Macbook Pro, Lion, no external keyboard or mouse:

Lately I noticed that I can't use Left Shift + Left Command together; it registers as Left Command only. The other three combinations (RSHIFT+RCOMMAND, RSHIFT+LCOMMAND, LSHIFT+RCOMMAND) work properly. I've confirmed this in text editors and in the keyboard viewer.

Same problem appears with left command + left control.

I've shut down all programs, verified no weird keybinds in Universal Access or elsewhere, even installed Lion to a clean external disk and booted from that. The first thing I did was check L-Shift and L-Command in TextEdit; same problem.

Any ideas?

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same problem... did you eventually figure it out? –  Lena Bru Aug 3 '14 at 19:44
I'd forgotten about this question, saw the notice on my profile, checked, and the problem is gone. In the meantime I've reinstalled, upgraded to Maverick, and moved from the midwest to the west coast. If anyone happens to test those three in isolation please report back! –  wilee Aug 5 '14 at 22:04
this problem started a week ago, and i was already a maverick user for a few months before it happened. I live in Israel..... I doubt your geographical location has anything to do with it. –  Lena Bru Aug 6 '14 at 6:51
I suppose you've checked related answers, but does anything in this help? apple.stackexchange.com/questions/23775/… –  wilee Aug 18 '14 at 17:12

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