Blindfold chess on RHP

On one of my games after my opponent made his move to my surprise none of the pieces on the board were loaded! All that was shown was a checkered board with two green squares, indicating my opponents last move. It did, however, let me click on two empty squares to make my move.

I guess it has something to do with your browser. Lots of weird things can happen. When I switched from Internet Explorer to Firefox, all of the animated forum avatars went into hyper speed.