Sorry to fill up this thread, but I think I have found the problem. On my iMac 
I had my display sleep set to one minute, since I figured I don't need a 
display anyway. I believe this caused the problem. I adjusted it to Never and 
the awful lag seems to have stopped. It would also explain why it happened 
after a period of inactivity. Interestingly, this does not seem to affect my 
MacBook Air. So if you have an iMac and notice this problem, you may want to 
open System Preferences, go to Energy Saver, and check your display sleep. I'll 
let you know if the problem persists.

 - Austin




On Aug 27, 2012, at 11:32 PM, Austin Seraphin <[email protected]> 
wrote:

> I just upgraded my iMac to Mountain Lion. I use a standard Apple keyboard. 
> Now I notice if I leave it unattended for a few minutes, the keyboard seems 
> to lock up. Hitting a key makes it eventually repeat it a number of times. 
> This seems most apparent when using command-tab to switch to another program. 
> Chaos! Has anyone had this problem? Any ideas of a solution?
> 
>  - Austin
> 
> 
> 
> 
> 
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