Unable to manage cluster as Failover Cluster Manager erroring on load

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http://serverfault.com – I have a Windows 2008 R2 cluster which I'm trying to manage from my local machine, however I appear to have broken Failover Cluster Manager somehow, and now every time I go to open it I get an error pop up saying... The operation has failed An unexpected error has occurred Object reference not set to an instance of an object On clearing the error, the program opens however when I got to manage a cluster (right click, manage a cluster) another error appears and prevents me from doing anything. The operation has failed The action 'Manage a Cluster...' did not complete (HowTos)