I have also had problems with the site lately. I am getting 404 not found errors right before the final booking screen (which is really annoying that I have to go through all of the steps again) as well as messages that say my session has expired, even though I have just logged in.
One error I did not realize is that my wife has not been getting the flight notifications that used to work just fine. I am doing everything like I used to do it, I put her email address in the notification section, but nothing makes it to her. These were bookings I did 2 weeks ago, so I know they are not just slow.
I cannot believe I am saying this, but I wish we could go back to the old website, which worked just fine for me.