Since upgrading from Windows 7 Ultimate to Windows 10 Professional, my DF wallpaper slideshow is not changing at the set interval. Regardless of the interval I set, the wallpaper changes every 5 minutes (what it was originally set to when I upgraded).
It almost seems like the interval got hardcoded (or set to read-only) into the system when I upgraded, and I can't find where to change it so it behaves as set in the DF menu.

Keith,

Here's the requested info.

I poked around in the troubleshooting log and noticed that Monitor 1 was set for 60 minutes, but monitor 2 was still set for 5. I didn't realize that when Background Mode was set to use a different image for each monitor, each monitor profile still maintains an independent timer.

Oddly, it was changing both wallpapers at the 5 minute interval.

I changed monitor 2 to 60 minutes... hopefully that will produce the desired result.

That seems to have resolved it.
Thanks for moving me in the right direction.