First, I have KLAX V2 (FS9.1, FSX, P3D).
Do I need the 1.3 update?
You always need updates of everything, especially with P3D
Have you changed in some way the default registry keys for P3D, to trick non-compatible installers made for FSX to install inside P3D ? This shouldn't be done, because it will likely create a mess to P3D compatible products like ours.