I've had this recurring problem lately that all the modifier keys AltGr, Ctrland Shift stop working. Alt still works, after a fashion.
I discovered the problem first when pressing Alt+Tab stopped working. It just makes the menu flash on and off. Just pressing Alt seems to activate the menues, though. Another example was when trying to type the
@ in an email address, and AltGr would not work, so it just entered a
2 instead -- the normal value of the key.
I've not experimented with it much, because it's been happening at bad times, but I will next time it occurs. The problem persists in all programs, like Firefox, WordPad, etc.
I tried restarting Firefox, but the only thing that works is restarting the computer. Then the problem immediately goes away. So it appears to be a software problem.
I am using Windows 7. My keyboard is old, perhaps 10+ years, but has been working flawlessly otherwise.
It is an Logitech "Elite" keyboard, the one with all the strange media buttons. Image here http://imgur.com/y5dbKeM
A perhaps unrelated problem is that the mouse has been freezing, and then being released with a windows-error sound.
Any help to diagnose the problem would be very welcome. How would I go about finding out what is wrong?