What do you do when that box pops up? I see it occasionally, too, and invariably it's not true, or corrects itself when you deny what it says. It might take one or two tries, just don't take WGT's word for it.
I think it's a slow load issue myself. I only see it when other screwy things go on like 2 players spinning while the guy on the tee completes his shot and you continue. Or the "your browser is corrupted" and you say OK and keep playing. LOL