Black screen when trying to log into RHEL Server from vSphere

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A few users, including myself, have been working in various RHEL VMs from vSphere. We get pulled away and then go back to what we are doing and there is a black screen that greets us. We are not able to resume control of that screen from vSphere. We often have to ssh in from a console and kill -15 session id number to free it up.

Looking thru /var/log/messages, it appears the culprate might be the following:

~~~
Jul 28 12:15:37 ameda4aisrx0236 gconfd (user-id-23386): GConf server is not in use, shutting down.
Jul 28 12:16:59 ameda4aisrx0236 gconfd (user-id-25871): starting (version 2.14.0), pid 25871 user 'dgfuqua'
Jul 28 12:16:59 ameda4aisrx0236 gconfd (user-id-25871): Resolved address "xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only configuration source at position 0
Jul 28 12:16:59 ameda4aisrx0236 gconfd (user-id-25871): Resolved address "xml:readwrite:/home/dgfuqua/.gconf" to a writable configuration source at position 1
Jul 28 12:16:59 ameda4aisrx0236 gconfd (user-id-25871): Resolved address "xml:readonly:/etc/gconf/gconf.xml.defaults" to a read-only configuration source at position 2
Jul 28 12:17:00 ameda4aisrx0236 pcscd: winscard.c:304:SCardConnect() Reader E-Gate 0 0 Not Found
Jul 28 12:17:00 ameda4aisrx0236 gconfd (user-id-25871): Resolved address "xml:readwrite:/home/dgfuqua/.gconf" to a writable configuration source at position 0
Jul 28 12:17:01 ameda4aisrx0236 vmusr[25940]: [ warning] [Gtk] gtk_disable_setlocale() must be called before gtk_init()
Jul 28 12:17:01 ameda4aisrx0236 vmusr[25940]: [ warning] [Gtk] Unable to locate theme engine in module_path: "clearlooks",
~~~

This server is fully patched, and other then the warnings for the last two lines, that is it.

A search on Google to didn't find any solution.

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