So you have taken the leap your going to build that Hyper-V 2012 Cluster.    You build your hosts, you configure Hyper-V and Failover Clustering.   Then like any good IT Professional you patch all the hosts to the same level only to find that when you open the Failover Cluster Management Console you get the bellow error when you click on certain objects:This error is caused by a .NET 4.5 update which can now be resolved by installing the following update on any machine you are running the console from: