This is usually solved by refreshing your browser cache - using CONTROL and R or Control and F5. It's a common problem.
http://www.chess.com/forum/view/premium_members/invisible-typing-in-forum
http://www.chess.com/forum/view/help-support/chess-board-not-loading
http://www.chess.com/forum/view/help-support/cant-see-my-peices-on-the-board
I do not see the pieces on the chess board. Since 3 days I can not make any moves.
Please HELP! Thanks!