SCVMM 2012 R2 - Error 2912

This also happens when im creating a "VM Clone", the SCVMM completes the "local" tasks (deploy harddrive, nic, etc) - but when its supposed to start the virtual machine and sysprep it, it fails with the same error code 2912.

The problem appears to have started, when i upgraded to Update Rollup 8.

But both the VMM server, and the agents on the Hyper-V Servers where also updated in the process - so this shouldnt matter or???

I have checked almost every post regarding error 2912, and all the solutions on other forums dosent seem to work.

Also i have tested with Windows Firewall set to disabled for both the VMM, and the Hyper-V server - and checked eventviewer for errors...

I really hope someone, will try to help me out - because this is really ignoring, and i cant seem to find whats going wrong :)

Thanks in advance!