@lexulous Thanks for your reply. By the time I picked up, it was several hours later and the board had returned to normal. Next time, if there's an issue I will screenshot right away.

@lexulous Putting in the new double check to ask whether player really wants to play that word is very helpful, thank you. It will stop me playing by accident when I just wanted to check a spelling....

@Nell-Nelson the 'next game' feature has vanished for me, and so has the ability to see the AI's and last player's move. I'm using Safari. Which has always been fine up to now.