2910 error refreshing Hyper-V R2 servers in SCVMM SP1 B1

Hi,

We have 3 servers and 1 works fine. All are joined in AD.

Since upgrade from RC1 to SP1 B1 I cant manage 2 of the servers. We have also tried this thread http://social.technet.microsoft.com/Forums/en-US/virtualmachingmgrhyperv/thread/4bd9be4b-0ff9-46f3-bf32-1b7c1245c494 without any improvement.

The error we get is -

"VMM does not have appropriate permissions to access the resource C:\Windows\system32\vmms.exe on the mshost2.hv1.local server.

Ensure that Virtual Machine Manager has the appropriate rights to perform this action.

ID: 2910
Details: Access is denied (0x80070005)"

Any help would be appreciated

/Mikael