Hey Rory,
I’ve actually just managed to fix this. If you remember this thread, I had my Cabbage relinked to csound built from source in usr/local/Frameworks because some libraries weren’t loading while using the regular install in /Library/Frameworks. Well, I linked Cabbage back to /Library/Frameworks, tested a VST and it was working (but I was getting the library warnings again), then linked it again to /usr/local/Frameworks, and everything is still fine. Weird, but sorted! Cheers