fusion monitors

In fusion, when I open the node editor and place the original media in Monitor 1, it looks fine.
But as soon as I start adding nodes, the video turns much darker and more contrasty making it hard to view (see attachment).
Does anyone else experience this? Is there a simple fix?
Any help would be much appreciated. Thanks,
Andrew
But as soon as I start adding nodes, the video turns much darker and more contrasty making it hard to view (see attachment).
Does anyone else experience this? Is there a simple fix?
Any help would be much appreciated. Thanks,
Andrew