[Dan_]

That fits most of the symptoms I've seen. If the new design got an ID of a design used by another player it may cause the server to silently trash the new design, and any reference to it (via ID) would now reference the other players existing design - construction queues. Buy why then did the problem not occur in the pbw test game when I processed the turn localy? I was very carful to make sure it could only use exactly the same files as those sent to pbw. I can't remember, but I may have only had one player (myself) in that game too.