Black screen or no screen accessing virtual server via web browser

A couple users are trying to access the virtual server via a web browser.  Their accounts have "Full, Modify, View, Remove, Change, and Control" permissions.  They can access the link.

User 1 can see the 4 virtual machines running (small screen captures), but when she tries to access the host she gets a black screen.

User 2 cannot see the 4 virtual machines running (small screen captures), but he can access the link.

Two other users can access the link just find an click on the virtual machines just fine.

Any ideas?
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smcitsvConnect With a Mentor Author Commented:
Thanks to all of you for your time, but ended up solving the issue which was related to permission to the folders holding the VM instance.

What browser/version are they all running?  I would recommend IE 6 or 7.  There are definite problems with trying to access vm's through FireFox.
smcitsvAuthor Commented:
To answer your question the affected users are using IE 6 and 7, but the problem remains.  Could the VMM be managed by a GPO?

Are the users able to establish a Remote Desktop connection to the Vm's directly without going throuh VMM?  
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