I have tried pretty much all the things listed in those threads and more:
uninstalled the Qwings 787, then reinstalled the CRJ
same in reverse
replaced the navigraphOIDC.dll with the newer one
did a complete reinstall of P3D
scrubbed the remaining config files left after running the uninstaller, then reinstalled
repaired all the installed C++ libraries (the most recent one seemed to need it, based on duration)
scrubbed leftover registry keys, then reinstalled 18.104.22.168
and.....dark cockpit again.
There's clearly something left somewhere.
Could we get a spreadsheet or a Visio chart of all the files that are installed by V22.214.171.124?
Also, it would be nice to be able to download previous versions, not just the very last one as I don't have V5 yet.
v126.96.36.199 worked perfectly before, I'd like to get it back.