I would recommend that you try clearing out the browser cache/temporary internet files as this will likely help to correct problems like this. Also, you should test the Tactics Trainer in a different web browser to see if this will correct the issue.
Tactics Trainer ignores my move
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Several times in recent weeks I have made a move in tactics trainer and it is ignored.
1. The move is made on the board and my piece is displayed in its new location.
2. The timer continues to run.
3. There is no way to finish the problem and get to the results screen. The move cannot be undone or redone. You are helpless until you eventually give up and exit the problem window.