I saw this one last night for myself and I’ve just seen a week-old post by Mike Briggs on the subject. When you deploy KB978560 to your VMM 2008 R2 server, it will require an update to the agents. You’ll see a yellow exclamation mark icon appear on your hosts. When you check their status you’ll see that you must take manual action to resolve the issue. Simply right-click on the managed hosts, update the agent, and provide any required credentials. It takes a minute or two, then you’ll get your “issue” resolved.
Be sure to put the hosts in maintenance mode in OpsMgr if you’re using it. Otherwise you’ll get a bunch of alerts for every host you upgrade.