Problem(s) Encountered:

During early remote observing, in the beginning, MDM13WS1 may have either rebooted or had processes stopped. We could not start X11. Eric switched us to MDM13WS2, and everything worked.

Solutions:

It appears that somehow the machine was reboot at some point last night.  While I could ssh to it, vnc was not capable as obs13m.  I was able to vnc as root, getting to the login screen.  Once I logged in and the remainder of startup processes completed, I could once again vnc as obs13m.  It appears that X DISPLAY does not start prior to the login screen, disabling anyone except root from using vnc until the machine is logged into locally.