I apologise in advance if this doesn't make much sense to you. It took me a while to unravel what was wrong and I still don't know why. Update 5 was being applied to a 3.5 cluster and one of the hosts was being placed into maintenance mode. Most of the VMs were migrated to other hosts but one failed part way through and was powered off. At first I thought that one of the two hosts had a grumpy moment but the VM then refused to power on again and the following message was shown: Ooops. I had…