There are some old plugins that don’t bridge well in Renoise. The Focusrite Liquid Mix being one of them. It’s a shame, it’s a damn fine piece of kit.
I can start up one instance of it only, try to open a second and Renoise throws an error.
The workaround is to use JBridge with the ‘Run in existing auxhost’ option enabled.
Would be nice to get this solved natively.