Neither of the two auto-start apps I had were auto-starting anymore, I'm not sure when they stopped but I think it is since SU9. I don't always require the two apps.
After much mucking around and as a last resort, I decided to move FSUIPC and LogiMicrosoftFlightSimulator from their original locations that they'd been in for many months (FSUIPC was in a folder on my Desktop and LogiMicrosoftFlightSimulator was in its default install path in C:\Program Files) to my archive disk. Once I updated the paths in exe.xml, both apps loaded properly. FSUIPC wasn't minimized like it used to. But it worked at least!
There were two changes necessary to get the original paths to work. I had to do both.
1. The EXEs must *not* be set to run as "Administrator". Both of mine were. This is required whether I run MSFS as Administrator or not.
2. The folders have to have the "Users" group and be given the standard "Read" and "Read and Execute" permissions.
If you don't know how to set permissions, maybe try moving the folders of the necessary app folders to "C:\ProgramData". That's not great, but easier.
Good luck 🙂