The first thing you can do is to reload the game, and the game should continue from the last round onwards.
If you are unable to re-launch the game, please try clearing cache & cookies in your web browser. Here you will find instructions for different browsers:
Google Chrome
Internet Explorer
Firefox
Safari
If the above steps do not help, please contact our helpdesk. Please include the game name, time and date the issue occurred and the round ID number, which you can find in your gaming history.