I experienced a similar issue. On a new BIAB Song I used a number of Utility Tracks that were audio tracks, RT's, not MIDI. But when I opened the BIAB file in RB, all of the Utility Tracks were MIDI Tracks. I deleted them all and just regenerated the RT's, but that was puzzling.

Scott


My stuff:
https://soundcloud.com/scott-h-olson
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Sonar Platinum, Studio One Pro 4, Windows 10, Hybrid Home Studio