I invited my two teammates to play 3v3 ranked, but the "Start Game" button is gray and says "You must be three in the team to join the queue".
We are three, but can't play.
happens all the time, just quit lobby and re invite then you should be good to.
We had to have one guy leave the team completely and then invite him back to the team for it to work.
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.