Black screen when starting whiteboard with DisplayNote Launcher

If you are running FlatFrog Board 4.x on a Windows PC together with DisplayNote companion you may get a black screen when clicking to whiteboard.
This is since both DisplayNote and FlatFrog Board for rooms want to run in full screen.

There is a easy fix for this. 

In launcher enter Settings and Shortcuts.
Under Command line arguments add the string -fullscreen and select save.

Now it should become white background when you "Tap to start whiteboarding"