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0e1f616
(Get the code!)
I am seeing this on 15.10, running nvidia GTX 670 with proprietary drivers.
I recently changed monitors, I had Dell 2560x1440 and LG 1920x1080 and everything was working out as it should. Now I have Dell 3840x2160 and LG 1920x1080.
And sometimes after the screen is unlocked windows are pseudo randomly displaced and resized. Most of the time they aren't on the same virtual desktop, not the same size and also physical position is different. Something really strange is going on.
Sometimes certain windows have only title bar and an outline visible and are otherwise inaccessible.
Also, locking the screen manually and then immediately unlocking works. So this might be connected with the screens being turned off and then back on?