thanks Victor. Hopefully the other posters will find the same root cause (ie that the TTF is from 9-11 fees on award or companion pass tix) and save themselves from trying to book online. Hopefully it gets fixed soon, but in the interim you'll have to convince an agent to book the fare even if its web-only or DING... I'd imagine if it doesn't work after a couple of tries posting here will get you some assistance.
Good luck all and thanks again Victor