When I go to the description page for a TB that I've been watching, I'm allowed to add it to my watch list (again), but removing it is no longer an option. The same thing happens with Geocoins. I've had the same results with Firefox 2.0.0.16 and IE 7.0.5730.11 using Windows XP Professional 5.1.2600 SP 2 Build 2600.
By the way, LOVE the driving directions.