What have you tried so far? Are you using an updated version of Java? You might also check here for common issues: http://support.chess.com/Knowledgebase/Article/View/4/3/im-trying-to-play-chess-but-i-cant-see-the-board
My board won't show for Live Chess.
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I've had an intermitent problem with this also. I usually just wait a couple days, and it works again. I figured in my case, it was because I was not a paying member, but maybe not..
I have played live games a couple of weeks ago, but have since been unable to pull up the board. I don't know what else to do, and am not having any problems with my correspondence games.