Simple: I usually connect to my main iMac in another part of the house over the network using screen sharing on MBP for portability. Everything fine until a few days ago, now it just hangs when accessed by the finder sidebar. I haven't changed any settings. None. The coincidence is that this has more or less happened at the same time as the MobileMe switch off, but I signed out of that ages ago, and there's not a mobile ME sign out option in system preferences anyway. Besides, I was never connecting via Back to My Mac anyway - just through the finder.... What gives?