Resolve black boxes - multiple monitors and display settings

When you are using multiple monitors, you might get black boxes showing up on SlideProof panes: 

If you get these, it means that you are using different display settings on your monitors. 

How to solve this issue?
  1. Open PowerPoint
  2. Select "Optimize for compatibility" under Display Settings in the lower bar in PowerPoint (see screenshot below)
  3. Restart PowerPoint 

Note: If you cannot see the "Display Settings" it means that your screens are using the duplicate function and not the Extend function. 

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