So I've upgraded to Catalina on the MB, haven't had any issues at all using Showbuddy Active yet after a few shows.
I have noticed a problem with setlist though.
When my footswitch (FS-7) was connected via the DMXIS interface I encountered an issue where tracks would frequently stop themselves as if I'd hit the footswitch. I picked up on this during sound check and got around it by just starting the tracks directly from the laptop, so it wasn't a huge issue, just a bit irritating.
Pretty sure it's not the FS-7 or cable as I've used it with SBA for two shows since and if it was randomly sending a signal then it would be triggering scene changes, and it isn't.