Periodically, Start11 stops working on my secondary & tertiary monitors. The Start button reverts to the Windows 10 button, and clicking it brings up the Windows menu instead of the Start11 menu. If I close & then restart DisplayFusion, the Start11 Start button & menus start to work again on the additional monitors.

"Minimal" debug info exported & attached.

I'm not sure. Since I usually use pinned shortcuts on my taskbars to start programs, rather than the Start menu, and the custom Start button I use with Start11 is very similar to the regular Windows 10 Start button, it's not very obvious when it happens. I also leave the pc on all the time and don't put it to sleep.

It's happened at least twice that I've noticed. I think once with the current version of DisplayFusion and once with the previous beta, but I can't be certain.

This is still happening, and I still can't tell when or why it will happen. I have upgraded DF to 10.1 beta 7, and Start11 to 1.47. Latest debug file attached.

I have the same issue, but with Start10. I reported it here a day or so ago, and provided a log file.
I'm using DF 10.1 Beta 7, Start10 v1.97. In my case, the non-primary monitors merely display my selected Windows menu icon, but they are nonfunctional. Primary monitor menu works fine.

I reverted to DF 10.0 Beta 6, and the non-primary monitors work fine with Start10.