Optimize Hosts and Start Maintenance Mode Not working with warning (23756)

I have a new 2012 Hyper-V3 cluster, with SCVMM 2012 SP1.
Putting a Server into maintenance mode used to work, it would live migrate all the virtual servers off the host and pause in the cluster.
Also the new Optimise Host Feature also used to work.
Now all I get is this :-
Warning (23756)
Changes have been made which should be verified by running placement again.
Recommended Action
Use the Refresh Preview action to run placement again.
you can manually live migrate all the VM's of the host then put it into maintenance mode and all works fine !.
I do not understand what this "use the Refresh Preview Action" is. I cannot find any reference to this anywhere.
hope someone can help
many thanks
Mark Green

Hi Mark
Firstly, the error text for this event is wrong, which is why it has a confusing recommended action. This error indicates that while planning an evacuation, something unexpected occurred when reading the underlying hosts and VMs. It may be something
transient, in which case you can attempt to manually the VMs off the host, and then see if this error resolves itself.
If there is something more fundamentally wrong, you can find what the underlying error is by collecting traces. Search the traces for the error text, and you should see the underlying problem embedded in the trace right next to this error.
Details of how to collect traces: http://blogs.technet.com/b/chengw/archive/2008/05/08/how-to-collect-scvmm.traces.aspx
Apologies, this error is very confusing and does indicate an unanticipated problem in our product. We are working to improve this experience in future versions.
I hope this helps!
Cheers, Hilton

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