vm (invalid) and greyed out

A number of vm's in a vSphere setup were showing VMWare Tools not running. Checking the vm's themselves showed that it was running. I tried reinstalling VMWare Tools, but when I clicked the "Install/Upgrade VMWare Tools" the vm turned gray, and was appended with "(invalid)"

Some googling showed up this: http://communities.vmware.com/message/861038

•  Log on to the host where the vm is running on
• type: "service vmware-vpxa restart"
• type: "service mgmt-vmware restart"

The host and vm's that were running on there became disconnected in the interface for a few seconds, but after that came back, and the vm's VMWare Tools became OK. It turned out the vm's didn't need updating anyway.