Yes, I am having the exact same problem and it started for me two days ago. I've now spoken to two agents at the 1-800 number, and they have been of no help. The first one told me they were aware of the problem and were trying to fix it but that it was only with certain browsers. I've now tried on three different computers using different browsers and none work.

I called again and was told by a different agent that it's not a technical problem it's a "business thing" and it's not possible to book those flights online and never has been. I know that that is not correct, as I've never had this problem before. I asked his to please send a note to the technical support people and he said he would. I'm not certain what to do at this point...I figured I'd wait it out, but I may post on the AC rep thread.