Hi Rob,
I haven't come across said issue, however my setup is slightly different to the one you're running. Specifically I'm missing the PMDG 777-200LR/F for P3D :ph34r: ! However if you can arrange to shoot me over a copy of the PMDG 777-200LR/F for P3D I'd be happy to give it a try for you!.
Regards,
Craig Dykstra