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Despite now being physically present in front of the Mac, I can't find a way to unlock the screen. (Latest ARD and OS X 10.8.2 on both machines.) When this happens, I come in to work the next day to find the big lock icon and message on my Mac's screen. Unfortunately, there's a bug of some kind that causes the remote Mac's screen to stay locked, even after I've disconnected from it. My work Mac's screen shows a big lock icon and a message while I'm remotely controlling it from my home Mac using Apple Remote Desktop (ARD). I use this when I connect to my work Mac from my home Mac. Apple Remote Desktop has a "curtain" feature that a remote client can use to lock the screen of the Mac that's being remotely controlled.
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