I have the same problem, unable to create a game, the online servers must be down.

same problem here also cannot invite friends.

Same here. Play/game setting buttons gray out and then nothing.

Same. Not able to start an online game. After clicking "Play", the play and game settings buttons go grey and nothing happens. No load screen, no errors, nadda. Game has been working fine until today.

i think the server is down or something. frustrating - there should be a maintenance notice in the main menu.