Halion 6 - only one side of stereo pair working

I’ve been using Halion 6 for years, and really like it. BUT out of nowhere the left side of stereo outputs stopped working. It’s so crazy! The stereo outputs were working great, then the next day one channel only.
I’ve tried the obvious, but please let me know if you have any suggestions.

What is the obvious?
Halion stand alone version?

I’m using Halion 6 in Cubase 11. In this case the stock patch is routed to the master output. I verified that its not the mixer.