This seems to be a new feature (or bug) with version 6 and I can't seem to figure out how to stop it.
I have two home computers, a desktop (with dual monitors) and a laptop (with a spare monitor attached)... I have different wallpaper settings on each computer but if I make a change to one computer, it updates the wallpaper on the other computer. The strange thing is, it does not change the settings it just applies the same wallpaper to the other computer.

In other words, let's say computer 1 uses a WallpaperFusion search for "Bunnies" to set the wallpaper and computer 2 uses a WallPaperFusion search for "Death Metal" to set the wallpaper. As new images are loaded I sometimes get death metal on my bunny machine and bunnies on my death metal machine.

How do I stop this?

Thanks Keith. That looks like it was the issue.
Strange that it didn't happen until both machines were on displayfusion 6.0 though.

I was about to make a new thread regarding some strange things sometimes happening to my pc's wallpapers when I had them both turned on.
I think this might be solving my problem.

Forgot to make a reply here, so that others can get an answer, and I can tell you, it worked.

Microsoft should really not make this option turned on at default; it should be an option for those that would like a feature like this, well imho.