As I was(actually, still am) playing the 9:00(pst) tournament in the "West" room and from the point where it said there was 25 minutes left in the tournament, EVERY CHALLENGE I MADE GAVE ME THE, "Unable to send your challenge as your opponent...."! After about 7 minutes, I finally decided to quit the game a play on the "East" side where I was refused by a couple of EVOers and every challenge after gave me the same thing! I quit, went back to "West" room and continued to receive this message!
WHY? I know this will cost me a credit.
Sometimes it's saying your not active. If it is stuck, click on the filter(bottom of the play screen) and click quit game. Then a message will appear saying you've been disconnected. Just push reconnect and it will reset your screen. Reloading the page doesn't always work.