Microsoft released a hotfix rollup package (KB976244) for System Center Virtual Machine Manager 2008 R2 (not VMM 2008). It fixes three issues:
If a virtual machine that was created from a template fails during the customization phase, the owner of the virtual machine cannot use the self-service portal to connect to the virtual machine.
The Enable spoofing of MAC addresses option in the virtual machine properties is cleared when you configure the network adapter to connect to a different virtual network.
The "Refresh host cluster" job can take more than 10 minutes to finish.
This update is available via Microsoft Update. Make sure you approve this update if you’re using WSUS, ConfigMgr or something else to control your updates.
There is also another update (KB976246) available for VMM 2008 R2 (only). It deals with this issue: “When you remove a virtual hard disk from a virtual machine in System Center Virtual Machine Manager 2008 R2, the .vhd file on the Hyper-V server is deleted without warning”.
Again, the update is available via Microsoft Update. After you install the hotfix you will get this warning every time you attempt to delete a VHD in VMM 2008 R2:
“You have chosen to remove virtual hard disks from virtual machine VMName. This action will delete the .vhd files.
Do you want to continue?”
I’m approving the updates now on our WSUS server to deal with these issues.