FREE - In Google Play
FREE - in Win Phone Store
That's about it really. Started happening after your latest site maintenance.
It happen to me as well, I manage to get in through forum post.
It links to: http://www.chess.com/forum/view
The daily puzzle link is: http://www.chess.com/forum/view/daily-puzzles/292013---rotlewi---rubinstein-lodz-190708?page=1