|New Player - join / decline game button are both greyed out: 6/15/2011 20:29:04
The buttons are grayed out if you're not invited to the game.
When you invited your friend, it sent them an e-mail which walks them through signing up and joining your game.
You used the words "new account" which leads me to believe that your friend ignored the email, created a new account through the website with a different e-mail address? If so, you should remove their old one from your game and add the new one. To do this, click "Add/remove players", drag their old one to the left side, and click "Invite new friend" and type in your friend's new e-mail.
If you still have problems, shoot me an e-mail at email@example.com and I can help further.