While using a Read Only Domain Controller as a Host is possible, it is not a best practice. Nonetheless, a few customers are running into issues when attempted. One of our SCVMM engineers researched the issue and has developed the method below that addresses security needs of SCVMM. This will also appear as a Knowledge Base article soon. Remember, this is not a best practice, and troubleshooting will mean demotion to a member server from RODC. Thanks Steve!
What is a Read Only Domain Controller? http://technet.microsoft.com/en-us/library/cc732801(WS.10).aspx
A Read Only Domain Controller (RODC) can only be used as a Host if it was already a Host prior to being promoted. If a RODC needs to be used as a Host and was not previously managed by SCVMM, it will have to be demoted to a member server and made a managed Host prior to promotion back to RODC.
IMPORTANT: Although a Read Only Domain Controller can be used as Host in SCVMM, this is not the recommended usage of a Read Only Domain Controller.
NOTE: If the steps above do not work, demote the server to a member server and start over. This time, after Step 7, on the “Delegation of RODC Installation and Administrators” section of the wizard, set BUILTIN\Administrators as the group.
Applies to: Windows Server 2008, SCVMM 2008, SCVMM 2008 R2