From the description of the problem you gave by email, you said that it was ONLY the PMDG 747 that was crashing, not "every aircraft that doesn't have contact points".
All FSX airplanes have contact points, I don't see how they could work without, unless they replaced the flight model *entirely*, which is really a first, and as I've already asked you by email, are you SURE that it's normal your PMDG 747 doesn't have contact points ?
Because, as I've said already by email, nobody ever reported this problem before and, since the PMDG747 is fairly well known, it seems strange that nobody noticed it so far so, it's possible it's a problem with your PMDG747 installation ?