I've been trying to create a new game this afternoon, but have not been able to do it successfully.

I go to create game, select private, add the accounts I wish to invite, set up the rest of the settings, and click OK, but it just takes me right back to the same screen with no game being created.

I have tried in Firefox, Chrome, and Internet Explorer with the same behavior. Am I missing something?

This is the first time I've tried to create my own game, I usually respond to invites from others.

Ah, I think I have it. One of the player's accounts is not active yet, but the error was collapsed in the window where I couldn't see it unless I selected public game and then re-selected private game.