Is FAB making our older projects unusable?

A few (that I’ve noticed so far) of my library things no longer work. I own them…

Hey there @Dolphard1! Welcome back to the community! FAB isn’t touching anything in previous projects you have installed on your system. However if you mean issues downloading some projects, this is a confirmed issue with the recent launch for MacOS and is currently being investigated. Though if you aren’t on a Mac, the Fab plugin itself is also having some issues, though not universally.