the problem is described here. it makes the bot almost unusable for me and has been going on since the last patch. quest use object is triggering the stuck handler code and other navigation problems.
http://www.thebuddyforum.com/buddy-wing-forum/85213-stuck-handler-questing-useobject-corners.html
http://www.thebuddyforum.com/buddy-wing-forum/85213-stuck-handler-questing-useobject-corners.html