Oddly enough, when I use my keyboard trigger to simultaneously launch iTunes and play a track, I get the initial track notification. But when I switch tracks or use my trigger to get track info I get nothing. I just can’t figure out why it’s no longer working.

Have run across this? More importantly, have you a fix? ;)

Sorry I just saw this comment. I would recommend reinstalling growl and growltunes and get that working again when changing tracks, and then from there get the script working again.