Basically everyone got into the arena but the timer was at 0 and we could still add energy but no one could move and it didn't start. I lost energy on this and it eventually kicked me for "non-participation".
The only thing I noticed that could have triggered this was before the countdown hit 0 someone Disconnected (Symbol was above their head). After that we were thrown into the arena with the problem.
This thing happened to me 2 and I lost 2 energy and 200 crowns not that a big deal just fix this so other players won't get a bug like this
http://i56.tinypic.com/2prze5f.jpg