Captains, We have just issued an update for Prepar3D v4 users that will alleviate the onset of a ctd/hung screen/black screens problem in the PMDG 747-400 induced by a change Lockheed Martin made during the release phase of Prepar3D v4.2. If you are a Prepar3D v4 user who has the 747-400 installed, you can obtain the update directly via the PMDG Operations Center.  A red notification bar will appear on the top right of the Operations Center when it is run, and you can probably follow t