Hans Vredevoort (MVP Virtual Machine) yesterday reported a issue with one of the January updates for Windows Server 2012. After he deployed the latest Windows Updates from January to the Windows Server 2012 Hyper-V Cluster it was not possible to view the roles of this Cluster and got the following error:
The issue only affect the MMC with the Failover Cluster Manager. All roles on the Cluster still run fine and without any issues.
After he reported this problem, he got a quick note from the Microsoft cluster team that KB2750149 was the cause of this problem and that the current advice is to uninstall this update until further notice.
Thanks to Hans for reporting this issue.