Which game and opponents username?
Which browser are you using? ( so i know which one to test with)
have you tried clearing cookies ?
This link, when you click on it, will clear your Chess.com cookies. When you refresh the page, it will have logged you out of the site. Can you then please re-log in and try the game again
http://www.chess.com/clear_cookies.html
Let me know what happens and the game[s] its happening in
When I. Try to move a piece it vaanissshes? ?? Plesdr jhelp