WMI Failure: Unable to update Local Resource Group

Hi

I have a Windows Server 2008 R2 Enterprise with Terminal Services installed.

This has been working fine, but recently I am unable to add any new Computers to the local Computer Groups policy on the RD Gateway Manager

I get the following error

WMI Failure: Unable to update Local Resource Group



Just to confirm this is on , then Resource Authorization PoliciesthenManage Local Computer Groups