It seems to me that what ends up happening is the machine is set to Go back to the lock screen on disconnect and it doesn't seem to do that also with the mouse and keyboard locked as well that setting seems to stay in play. What It looks like on my end is that these 2 settings are getting stuck in some way when disconnecting and then you cant even remotely get into the machine or get into to it from GoToMyPC it then just shows it as a black screen. This seems to be an issue with the settings in GoToMyPC I could be wrong but every time this happens (on multiple machines at different times) we end having to hold down the power button and forcing a restart of the machine.
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