I'm also on webtv, and it usually happens after I click on "move and go to next game"... What I do, and it works every time, is when that happens, I click on one of my "fav" buttons to get me back to the main screen. Then I click on a game, and after making my move, instead of clicking on "move and go to next game", I use "move and stay here". From this screen I click on the red numbers that show at the top of the page next to "main page", and that will take me to the next game. I do this 2 or 3 times, and after that the white screen disappears and I can use "move and go to next game" again.