I have an issue with Rewire losing group channel assignments.
I use Reason with Rewire, and send Output Routing to Group Channels (keys, percussion, etc). When I open a project (older projects that did not have this issue in pre Cubase 8.5 instances), the saved assignments change from my sub groups to Master Output.
Work around is to open a project, change output routing to the intended groups. But even after Save and re-open, the issue is back. The issue is not huge as I can re assign and everything works.
The only thing that has changed in my set up is upgrading to Cubase 8.5.
VST instruments do not have the same issue.
I think that’s enough detail, steps to reproduce are simple.