I haven't seen any of the login screen problems yet, but boy am I seeing screen flicker under mountain lion. It's possible that me not seeing login screen problems is because my main screen (the one anointed to have the menubar) is not a displaylink controlled screen. In addition to the screen flicker, whenever I invoke mission control the little window containing the image of the DisplayLink monitor is just messed up. In case it matters, I'm running 10.8.1 on a retina 15" MacBook Pro. I'm really looking forward to the next update for DisplayLink - I check every day for it!
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