unrated challenges have a little "u" next to them for unrated.
Filter for rated games
There was a bug with unrated games a few days back
http://www.chess.com/forum/view/help-support/no-points
But it was claimed to be resolved.
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In the last few days, I've got a problem that keeps coming up. I accept a challenge that fits my filter and after winning the game, I find that my rating doesn't change, because the game was unrated. The only indicator that the game is unrated is that you don't get rating points. I think that there should be a filter for this, and also it must say somewhere whether a game is rated or not.