![:)](http://www.bridgebase.com/forums/public/style_emoticons/default/smile.gif)
It turns out that North and West took their cards from one board, while South and East took them from another. It was 3-board rounds, and after we finished the first board, someone flipped the board, two players pulled their cards, then someone else flipped the board again and the other two pulled cards. The director ruled that both boards were unplayable, and scored them as No Play for both pairs.
17D talks about what to do if you discover this error during the auction period: you start the auction over and award artificial adjusted scores if the offender's call differs. But in our case, the auction period had ended when we discovered the error. And there were also two offenders, one from each side.
Did we get the ruling right? No one remembered being the one to do the second flip, so I don't think we could assess a PP to them.