I recently had trouble moving ANY piece, solved by navigating back to ongoing games list [ PLAY---> Play Online ], then re-opening game.....
chess pieces not moving

Quite interesting, but wait until it happens to you "rich" mate! Nothing drives me up the wall worse than someone saying "you have disconnected" when you can read their chats but they can't seem to read yours. Your time remains green and static, but theirs seem to move and is red. Theirs gets to zero and you LOSE the game!
l played three games - lost all 3 on time but my times were ahead. I waited for opponents to move. They did not. When I checked my games they were losses on time. Some bug I suspect on the new website. My rating also changed.