External Display Goes Black When Drawing

Microsoft has reported a bug on Windows 10 version 2004 for applications using drawing on duplicated displays

FlatFrog Board for Rooms users using Windows 10 version 2004 may see this issue if they are using duplicated displays. To workaround this issue we recommend you try one of the following:

  1. Change your display setup to Extend by pressing "Win+P" on your keyboard 
  2. Downgrade your computer to Windows 10 version 1909

Read more about the issue from Microsoft's memo here.