I've this grey/black squarein the middle of my screen, when I change working spaces it follows.

square in browser page and here square over desktop

  • A quick test to check if driver/graphic adapter issue or Software/Desktop one. Go Settings > Appearance > Behavior > Enable workspaces. Then press Super/Win+s. See if you have this square over all work spaces or it holds same position in the monitor? Take a screen shot and add it to the question.
    – user.dz
    Dec 22 '16 at 9:54
  • From when this issue started.
    – vembutech
    Dec 22 '16 at 13:45
  • 1
    Ok, I was simply stupid, overlay was caused by gnome-screenshot (selected only part of the screen and kept the window in background)
    – fedecupe
    Jan 4 '17 at 21:17
  • 1
    I've removed the 'solved' text from the question title; perhaps you can post your own answer explaining the solution and mark it correct.
    – user12753
    Jan 5 '17 at 10:18

Ok, it was my fault.

The overlay was caused by gnome-screenshot still running in background after a screencap was made.

Problem is solved closing all istances of gnome-screenshot

  • 5
    This is actually a bug. I had the same problem Thanks for your answer.
    – Adam
    Sep 28 '17 at 15:31
  • Same thing, thanks! Completely NOT off-topic. (btw, Dell Inspiron)
    – George
    Oct 25 '17 at 21:48
  • 1
    hahahaha ) I spent 30 min to figure out why by my own without googling
    – ses
    Jul 26 '18 at 19:37
  • 1
    This is an ubuntu 16.04 bug. my system is completely different than anyone here. thanks for figuring it out though, was driving me nuts.
    – TehTris
    Mar 18 '19 at 18:26

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