I have discovered a bug with windows explorer in combination with using the Wallpaper function with Display Fusion.

The (left) scroll bar (controlling all the drives etc) flashes/blinks. It seems to half itself in size.
Then the focus intensifies on Explorer and all the other windows and my pc stalls.
After a second of three operations resume as normal.

This happens every time the pc is looking for a new image to display. When I turned off the randomizing functionality this behaviour stopped.

Whilst I was in the process of putting it back, my pc halted and consequently crashed.

The wallpaper functionality was the reason I acquired DisplayFusion in the first place. This is a shame.