I am having the same issue but only on freighter aircraft in P3D v4.5.  I run both P3D v4.5 and v5.2.  The issue originally existed in both simulators.  I have since uninstalled everything, disabled my antivirus during installation, ran the installations as administrator and I still have the issue but now only in P3D v4.5 and only with some of the freighters.  So how do I submit a support ticket for this issue?  Please let me know because I could not find where I submit a support ticket.