Hi Matt,
just created SuperTrack 1805 on the BB Soloist Track, applied drag&drop to RB without a hitch. Works like a breeze.
Just for the heck of it, created SuperTrack 1805 on the BB Strings Track, applied drag&drop to RB -> and received midi notes with zero duration ant thus no sound at all on the pertinent RB Track.

Somewhere there's the mischief in these SuperTracks ...


Martin