Apps do not launch after fast user switch; requires restart

I have 3 users accounts on a mid-2010 with 12 GB RAM; two with parental controls - the kids.
The kids like to play games (particuarally Minecraft), so will log in a play for a while. Typcially when one is done playing they will use the fast user switch menu to go back to the "Login Window..." They are pretty good about shutting down the apps afterwards due to previous performance issues.
When the second user logs in, the only application that seems to work is Finder. Clicking on an app in the dock results in the "Denied"sound. Tyring to launch from Finder or from the dock using "Open" results in nothing happening. It just seems to ignore it - not even the spinny wheel.
It is almost like everything is locked for the second user and the restart clears it. Generally it is responsive for the upper menu items so it does not seem to be a memory or CPU issue. Activity montor does not show anything out of the ordinary.
This does not occur on my accout which I am currently running as an admin. (I shouldn't but am). I can login and run all the applications but if I switch to the second user nothing launches.
I have re-installed Mavericks, and ran both the file and permissions repair on disk. I cleared all of the old cahce. The only thing that seems to work reliably is to restart the system.
It also seems that if the first user logs out then when the second user tries to log in the system just seems to hang after trying to log into the second account. It swtiches to the user screen but gets stuck with the spinny wheel; this requires the one finger force reboot.

Generally yes, they will keep running. You can confirm this by running the "Activity Monitor" app to see their CPU usage.

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Apps do not launch after fast user switch; requires restart

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