I know that
Teambuilder still works as I am playing a dynasty with
11 created teams in the game that I uploaded just two weeks ago. However, I will say this... there are times when you go to the
Teambuilder website and it says an "error" occurred and you can't get in.
I also know some people have had problems when trying to create new teams... it simply won't let them. You can take an already created team and change them and it will work, but for some, they simply can't create new ones.
I personally have not had that problem. I have
46 teams in my
Teambuilder and all work if I so desire to upload them. As for your problem, you might try to log in to the website and make sure that your teams are still there. It's been known by some to delete their teams. If that has happened, you should be able to create at least one team, upload them to your system, then change them to another team, upload that team to your system and so on.
Hope this helps and good luck!!!