Since I figure GB would be the last update, and there is a method to root GB now (see: http://androidforums.com/captivate-all-things-root/484390-guide-how-root-official-2-3-5-kernel-swap.html#post3812463
). I rooted, installed Busybox, Superuser, and Titanium BU. Then uninstalled Tethering manager (along with the rest of the ATT bloatware). No more force closed and everything works as it should and I did not have to factory reset.