If is possible, before playing again, you can clear your cache.
If you're not sure how to do this, this link will show you a step by step guide how to do this on your own browser
board doesnt sow


Try here -
http://support.chess.com/index.php?_m=troubleshooter&_a=view
and try philidor_position and kohai's idea.
board wilnot show when playing live chess.