I just tried my projects that wouldn't load in Cubase 10 earlier with the new release 10.0.15 .....
And they now DO load without problems. I don't know what changed but it wasn' t something I did
(Note: The Soundtoys plugin trick didn't work for me in older versions of Cubase 10 either)
I can't find anything in the version history that might indicate this fix, but I'm sure something related must have changed in this latest release.
Do any of you have the same experience with Cubase Pro 10.0.15 related to this previous defect ?