I've searched for this problem and can't seem to find it. I'm having trouble describing it too. . . Last night all of a sudden, my Command Tab has gone haywire. I hit Command Tab and the Application Switcher window comes up and there is this very fast switching going on. Just like a stuck key. I have tried Command Button and the problem still happens (I've only got one Tab key that appears to be working fine when I press/hold it). Again, this just started last night, I figured a reboot would clear it up. After rebooting it still happens, even with only two apps open. Has anyone ever seen this? Does anyone have a fix?