I had Displayfusion (Pro v7) installed before upgrading to Windows 10 (from 7). A few months after the upgrade I uninstalled it to use the standard Windows 10 taskbar. That annoyed me after awhile since it didn't have a clock on the other monitors, so I went back to Displayfusion. Well now after re-installing it won't allow me to change the Wallpaper Source. It stays on Solid Color. When I open the menu that allows me to choose multiple sources, there's no OK button, only close (not sure if that's normal). I select another source, and hit close. Then it says on Solid Color. Please help! I've rebooted, and uninstalled/reinstalled DisplayFusion...to no avail.

After working with DisplayFusion Support we found the issue. Long story short, although I'd never used Internet Explorer since I installed Windows 10, something had set my Internet Security settings to High. I changed that to Medium-High and everything worked fine.

Thanks DisplayFusion!

I would like to report that I was experiencing the same issue, and the above mentioned solution resolved my problem. Thank you for getting back to us, kind sir!