“The biggest reason it didn’t get released is because it was a solo record, with T-Bone’s band,” Potter said.

That's the explanation I think many of us were hoping for.  Grace Potter is amazing in her own right, but if it's not Grace Potter and the Nocturnals, I'm glad they didn't try to pawn it off on us as such.  I still would have bought "Medicine" - but not without a little bit of medicinal aftertaste, I'm sure.