It usually seemed to be cured by resetting the browser cache.
Erik wrote: If you are using Internet Explorer or FireFox: make sure you have JavaScript enabled. Then try hitting "control+R" to do a hard refresh. If that doesn't work, try rebooting and then Control+R again. If THAT doesn't work, try reinstalling the latest versions of IE or FireFox!
http://www.chess.com/forum/view/help-support/board-wont-show-in-email-chess
Help !!, I have a chess board BUT I have no pieces. And this is in all of my games. It is not a problem with my computer as my other chess sites are working perfectly. Anybody out there ever experience this?