Hi Roland,
This sounds like the same problem as @Neil_Durant describes here: Odd Ivory II behaviour. It’s a problem only with the plugin scanner - Cantabile actually loads the plugin fine when manually selected.
Patching the plugins.cache.json file is a clever idea in the meantime.
I’m currently working with Synthogy to try and figure out what’s going on here. I’ll let them know that there are at least two cases of this now. It doesn’t happen for everyone though - Ivory x64 works perfectly fine for me here.
What version of Ivory, Windows and Cantabile are you running?
Brad