'..project created by 9.0.2 and this version (9.5.1) cannot open it'

Havent seen this message until now but C9.5.1 is refusing to load a project created on 9.0.2

Whats the deal with that?!

Didn’t see this specifically before! Rogue plugin or project corruption? Maybe try to open a new blank project and use the import function to load track by track to see where it fails?