I am having the exact same problem. I have high rep with the Champions and have received an invitation thru them to attend the hearings. The quest log asks me to go back and see Lady Webb..she told me about Thaos and her getting it on in Woedica hoods back in the day,but I cannot complete the quest. I don't want to cop out and say I burnt my bridges with all three when I didn't though it is the only way to advance at this point.