Since upgrading to 10.10, I see a "phantom" window, that is, just a window edge, in the ULH corner of the screen and occupying about 2/3 of the screen in either direction. The window contents (whatever they may be) are transparent but it's not very pretty. I see it on both of my "desktops" (Is that the right term for those plasma thingies?).
What can this come from?
What can this come from?
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