Well, received a mail today that the schedule has changed. Called up the European reservations in Dublin, talked with Barney who was very nice and knowledgeable, and it turned out that somehow my booking had 20 segments instead of the 16 that I had originally booked through the online tool. Of course, the reservation page on AA and the actual Amadeus booking pages never showed the 20 segments to me. Also the people at the actual RTW desk (in Dallas?) never mentioned anything about this to me.

He suspected this might've been due to the schedule changes on NRT-JFK, but I'm thinking with all the problems other people have been having as well, something is broken in the online tool. He got someone to manually fix the ticket, and hopefully it will now be ticketed soon. He also said that their systems have been really slow lately, so you might want to just keep trying to book something through there and then getting someone in AA to fix it for you as well - especially if you're also including the NRT-JFK leg.