Why is there a gray rectangle blocking my screen?

Virtual external displays (monitors) are not permitted when using Exam4. This includes the use of screen capture tools and OS features such as Sidecar or DisplayLink.

  • If you are using some kind of screen capture tool, stop using it and restart Exam4.
  • If you are seeing the image below or something like it, this may indicate that a virtual display is active on your computer.
  • Disable any virtual display tools in your computer's display preferences and try again.


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