iMac goes to blue screen when logging out of user account

I have two 27" iMac's that randomly go to blue screen when logging out of a standard account. I have repaired permissions but this keeps happening. I believe it started after a recent update. It does not do it when logging out from a admin account.

Anny suggestions? Both iMacs are the specs in my signature.

No hardware or software changes were made except for the updates. Since it is happening on 2 different Macs it would not be a hardware issue.

Thanks.

Try creating a new user account on both machines or one as a test. Don't load anything or install anything to the test account. See if it does the same thing. Let us know.