Howdy MG,
Bela Fleck is a banjo player supreme, who has played all sorts of styles of music on his banjo from bluegrass to Bach, and would probably love to do something like your piece here. You can check him out at
http://www.belafleck.com/
Re. the problem, with the file having such a winding history, we probably wouldn't be able to pin down where the problem was picked up. If you find that this type of thing happens when you're creating a new file with 2.3.3., though, please let me know.
ttfn,
Sherry