I've been trying that Track - Erase thing, but I'm still getting the message that T48 has data. First I select the track, then Track - Erase. I have no idea how T48 has anything in it.

Re the 2 bar count in, I couldn't find a menu option to enable it. As a workaround, I'm finding that I have to enter my chords starting at bar 3, then the song is generated correctly.