Testing with:
ESX 5.1-799733 on machine named ESXI1, with license installed
ESX 5.1-799733 on machine named ESXi2, with license installed
VMware-WSX-1.0.2-928297.i386.bundle on Ubuntu 12.04 with Python 2.6 in a VM named WSX hosted on ESXi1
VMware-WSX-Server-1.0.2-928297.msi on Windows 7 on a machine named desktop
When I attempt to access one of the VMs, the progress indicator is displayed, and nothing else happens. I see this same behavior form both WSX servers, and when attempting to connect to a VM on either host.
When I remove the license on either host, and revert to evaluation mode, I can get the console of any VM.
I found another dicussion (2156382) for WSX 1.0.1.