I believe that an error like this can be caused by an interruption in your internet connection while attempting a Tactics Trainer problem. If you believe there is an issue with a specific Tactics Trainer problem please provide me with the ID # and I will be happy to investigate this matter for you.
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I have now been twice forced to play for both sides. First I make my move but it does not registrate it and time just keeps falling. Then I can only make moves from the wrong side.