I was working on a new project with Audiobus loaded first then Cubasis and DM1. I loaded an old project to check something and noticed all of my audio tracks had been renamed DM1. I renamed them and saved the old project and then set up a test project to see if it happened again, it is reproducible!
The problem seems to be related to the track audio input select. If you leave it on Audiobus and open it later with Audiobus on it will rename those tracks.
I will try to get a few moments later to detail the steps if you need.