Could be as simple as that. Have you redone your MDN, MIN, SID, NV items, and reflashed a cricket PRL? That'll get you back up and going after you do the baseband update.
*edit* Also, whiterabbit has an updated autostart.sh on his site. It's been updated since the one I grabbed from tracfonejunkie that was dated the 10th of this month. Direct link to the zip can be found on whiterabbit's site. I don't want to list it without his permission.