We are looking into the issues with logins some people can log in and others can't, currently it isn't consistent either it is across steam browser and Facebook, but it is only some not all players.
If you login through the browser account with the credentials that it prompted you to make for your forum account you should be able to play, we are working on fixing an issue with the Facebook login.
If it brings up the button to accept the queue and it doesn't go through, that means someone else didn't click accept so it throws you back into queue.
It will take all the people queued up at the end of the timer, make as many games as it can make then throw the left overs back into queue at the front.