This just worked this morning for me:

AGI- take the whole number of the AGI. For example a  -1515 would be entered as 1515. No parenthesis and no - symbol just the whole number. 

IMPORTANT: next questions asks if you are getting a refund or if you owe...THIS is where most are getting caught up and this is the magic...answer that you OWE MONEY. Then when it asks how much put 0. I know I put that I was getting a refund and then 0 last time and got locked out.

AGAIN, 

whole number AGI 

You OWE money

Amount owed 0

Hope it works for you as well. Hang in there and all the best.