Hi there.
I've been noticeing that V5 is better in ML than is was earlyer on. Not perfect yet however. I often (but not always) end up with the second screen just going black, with all it's content pushing back to screen one. Also maybe related to this in some way, when the computer sleeps or the vm does, the screen resolution also reverts to whatever the windowed view is currently. (network policies make it lock down on it's own, I don't believe I can change that)