I've installed the VMWare server, and as many, hit the issue of an empty screen.
It appears to happen upon the subsequent logins. Obviously "empty screen" can be caused by a lot of errors, but in my case it seems to be some SSL-related issue, in /var/log/vmware/hostd.log I saw:
[2009-12-07 11:58:12.150 'Proxysvc' 1093462352 warning] SSL Handshake on client connection failed: SSL Exception:
[2009-12-07 11:58:12.316 'Proxysvc Req00102' 1081919824 warning] PendingServerStrm: client write-completion error: SSL Exception: error:00000001:lib(0):func(0):reason(1)
[2009-12-07 11:58:12.573 'Proxysvc Req00101' 1081919824 warning] PendingServerStrm: client write-completion error: SSL Exception: error:00000001:lib(0):func(0):reason(1)
What seems to help - is holding the Control key and hitting the "reload" button when I am on the page that does not show anything.
Then the page reloads fully and I get the login prompt to login into the VM.
Hope this is useful to someone.
I later tried on the ff-3.5, and there Ctrl-Shift-R for reload, apparently did the trick as well.