Hey everybody - I have some good news (fingers crossed)!
Last night I went through deleted ALL of my payware scenery through Orbx Central, Contrail and Aerosoft One (as you might imagine this took a while). After doing this, I deleted my old Content.xml file and ran a registry cleaner (which was filled with errors). I then went through an reinstalled a few products that I confirmed did not load before. Well after reinstalling they all loaded in perfectly (with some exceptions) and very quickly. I’m having issues with some airports not having any ground textures, they just have the satellite image overlay (not sure if these particular airports need to be updated for SU6 or now, but I’ve dropped LVFR and a couple other devs some messages).
It is with noting that just before SU6 dropped, I got a new NVME drive and put MSFS on it all by itself (this drive is reserved for MSFS and DCS ONLY). I think it’s possible that because of this, there were registry issues or something with these payware sceneries as they are supposed to automatically drop symbolic links into the Community folder after installing the actual files on a separate storage drive, at least this is the way I have my installations setup.
I haven’t reinstalled all my payware yet as I have a LOT, so we will see. I have also not linked a lot of my freeware back in yet either. For those that had this same issue: delete all your payware, delete your old Content.xml file, run a registry cleaner (I recommend CC Cleaner), create new scenery libraries for anything installed via Orbx Central, Contrail or Aerosoft One, run a registry cleaner again, restart your PC and say a prayer.
I will keep this thread updated as I experiment more!