I have a custom MMC I created on my workstation (Win 7 x64, fully patched) with my most used plug ins (Exchange, AD, GPO, etc.) and it all works fine including the Hyper-V plug in. Except for one really annoying problem. If I exit the MMC (even saving as it asks to) when I re-launch it my list of added Hyper-V servers is not remembered.
More of an annoyance than anything else but still a problem.