I'm afraid reinstalling everything from scratch would be the only way to get things going again.This "secret cache" theory must be the culprit here.I hear ya...
After this last game update, I couldn't even load any of my airports I was working on. Nothing would load, immediate CTD.
How did I fix it (this is so strange), well I loaded a nearly blank airport that had barely any info (an old XML file from FSX). After loading the almost empty airport, VOILA.... Suddenly I could load ALL my other files again. I am not talking about in a single game load or a single instance, I am saying I was about to have to reinstall the game after 2 hours of trying to get any file to load in the project editor (massive fails). There is a "secret cache" the game uses or something.
Actually, I think I am going to reinstall the game fresh given the way their update code works seems a little strange.
Figure this out:I open a previously made project in dev mode.Removing some objects.Save the scenery.Trying to open another previously made project.To my surprise both projects are visible simultaneously for a while and everything freeze except mouse cursor which becomes unusable.In task manager MSFS is reported "not responding",close it from there as it was the only way to tarminate it.
Apart from this there were several additions I've made to an existing project that wont saved eventhough I saved the scenery and built the project.Next time I opened it was as if I did anything,nothing was saved!
Only thing I'm happy for is I did nothing wrong and the issues are coming from SDK itself.
But how about our previous projects?It is certain they'll be fully usable after reinstalling just by copy them in the appropriate file structure?