I’ve been using Logitech G flight switch panel and multi-panel, quite successfully I might add. Installed update 12 yesterday. After that, panels appear to be working until the aircraft loads for my selected flight, THEN the panels go dead! I had no problem with these before the update.
There’s nothing for this aircraft in the Community folder.
ALL SUGGESTIONS WELCOME!
No issues with mine, but have seen similar posts reporting the same as you since SU12.
Take a look at this thread and see if the fix applies to you.
https://forums.flightsimulator.com/t/saitek-plugin-not-working-after-update-12/582633/13
Don’t know if this is related to my problem, but I found this in the Windows event log:
Faulting application name: LogiMicrosoftFlightSimulator.exe, version: 0.0.0.0, time stamp: 0x5fd0e575
Faulting module name: ntdll.dll, version: 10.0.19041.2130, time stamp: 0xb5ced1c6
Exception code: 0xc0000374
Fault offset: 0x00000000000ff6a9
Faulting process id: 0x483c
Faulting application start time: 0x01d95e624c0b2ebb
Faulting application path: C:\Program Files\Logitech\Microsoft Flight Simulator Plugin\LogiMicrosoftFlightSimulator.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report Id: cedc0028-8d3f-48af-b290-7f19c947a815
Faulting package full name:
Faulting package-relative application ID:
May want to uninstall / re-install the plugin.
Thanks for the suggestions! I used the flight panels test programs you linked above; they’re showing everything working between the computer and the panels. Re-installing the plugin is the next logical move.
Bad news, team! Logitech no longer has software for these panels available for download … at least none that I can find after an hour’s search. If anyone finds it and can forward a link, THANKS!!!
Sure they do.
I had a similar problem ands I found a solution, at least in my case, but if you look at the tread I started it may help. I see someone posted the link here.
Found the download! Strangely-built web page confused me. My wife says I’m easy to confuse these days! 
Will update tomorrow and test. It’s getting late here.
Problem appears to be resolved with a flight panel software reload. I’m assuming the most-recent FS update disrupted the old installation, but that’s just my assumption based on the timing of the update and the flight panel failure. Thanks to all for your suggestions and help!!! 
Sometimes updates wipe essential lines from the exe.xml file. In that case msfs doesn’t auto-start the apps anymore. Re-installing solves the issue.
I ran into this issue after Christmas when I build a new computer. Could not figure it out all, ended up having to write a batch file to run after starting the sim…. My solution was Spad.Next which I picked up after upgrading to a honeycomb yoke from Saitek. now everything works amazingly and I have each aircraft setup differently to meet specific needs