I have same problem. I did update billing information, I have 100% of 10 questions and I still can not upload the mesh!:matte-motes-crying:
Drew my attention to the progress line, 9 cells green and the last is gray on 10 question.
Can see it on screenshot: http://i26.fastpic.ru/big/2011/0827/ab/db98a966c263c03c9b4bf6a8fd6bc0ab.png