Now, as a non-pawn star (yet) I believe my maximum amount of active games allowed is ten. Now, I currently have nine active games and am unable to start a new one. I get the en game limit screen when I try. I'm not complaining, but I thought I should point it out in case it's a bug. Thanks!
It's been discussed several times and I believe it is some sort of temporary bug. I think it clears itself up in a few hours or something and then you will be able to get that tenth game.