try changing your board size and pieces style. if that doesn't work, can you load these files?
http://cssjs.chesscomfiles.com/css/play.v2010122801.css
http://cssjs.chesscomfiles.com/js/chess/css/chess.v2010122801.css
http://cssjs.chesscomfiles.com/js/chess2/bundled/ChessViewer.v2011011301.js
http://cssjs.chesscomfiles.com/js/chess2/bundled/DiagramViewer.v2011011301.js
Now both browsers are working. I have been having this on and off for the past couple hours with both browsers.