Apologies for cross-posting.
20110101 snapshot now introduces code clean-ups including revamped "to-front" and "to-back" algorithms which do not rely upon the cut/paste/undo hack and thus do not affect any of the other objects on canvas. Consequently, there is also addition of a special undo/redo actions that deal with to-front/back actions.
Latest snapshot is available from the usual place: http://l2ork.music.vt.edu/main/?page_id=56
Complete changelog since 11/25/2010 is available here: http://l2ork.music.vt.edu/data/pd/Changelog
Cheers!