If a client crashes, a different user cannot log into that client without intervention

[kylemhall]

Describe the bug If user1 is logged into a computer that is force rebooted or something along those lines, user2 cannot log in unless an administrator manually logs that session out from the administration interface.

To Reproduce Steps to reproduce the behavior:

1. Log in to a client as user1
2. Power off the computer, force a reboot, or user task manager to close the client will still logged in
3. Log in to the client as user2
4. Note the error message

Expected behavior user1 should be logged out, user2 should be logged in