AOL shuts out Trillian users in battle over IM “… in the past 24 hours, an elaborate game of cat and mouse has developed between AOL and Trillian creator Cerulean Studios…” So, go and download the latest version of Trillian, 0.721 and that will fix your problem, at least for today until AOL figures out how to block them again.
This happened with Odigo and with Jabber. Trillian has been a paxtonland favorite for the last couple of months at least. We are also having problems with conversyx as well. AOL has also shut us out apparently. I wish them the best. AOL is a monster of corporate greed.