Pretty much what the title is. This glitch is avoided entirely if your default Audio and MIDI tracks don't contain this symbol at all. Working on a way to ignore it, but this is actually pretty difficult because Ableton evaluates the '#' symbol as soon as a track is created before the script can deal with it. This is probably an error more nuanced than what I can fix with a remote script, as the evaluation of the '#' symbol is probably happening internally at the C++ level. Open to any help on this!!