If any body else is encountering this issue, please rename the folder and see if it starts working for you. Please donot delete the folder and just rename it. Send us the renamed preference folder for investigation into this issue.
I've been having the same issue with CS6 18.104.22.1684
It's maddening. Like sometimes the keyboard doesn't work. The same thing happens with mouseclicks trying to select an object. I have to click numerous times to get a selected object.
This isn't just a time lag or memory issue. I literally can't get an object by clicking and then arbitrarily sometimes I can after a few clicks. The arrow and shift keys are randomly not working at all either!!
OSX Lion Macbook Pro 8Gb RAM and an i7 processor. I don't have any similar issues in any other program.