Does anyone know the reason for this?
I think I can answer that. First off…it’s not an OS thing. It is a VST2 vs. VST3 thing.
WIth the new U-He installers, there is the possibility to install both VST2 and VST3 versions of the same plug-in. They can both exist in your plug-ins folder as long as the VST2 versions are isolated into a folder of their own. And of course, the two can be identified by the // or /// in Cubase.
My guess is you are using the VST3 version. Specifically v2.6.0 r.1556.
That version will not do drag and drop, nor can it perform “Reveal in Finder”. However, the VST2 version (same rev) will work as expected. I’m guessing that’s the version Soul Patch is using.
The AU version works fine. That’s why it works in Logic. Additionally, the VST3 version will fail in the latest version of Studio One 2… whereas the VST2 and AU versions will work (Studio One can launch VST or AU plug-ins)
It’s a U-He thing. It is being investigated over there.