Posted this in Simdirector board, no answer.
Using P3DV5.2HF1 Vanilla install, no addon's or scenery added yet. Airport KSLC
I place an object adjacent to a taxiway ( model that has a rwy number - eg 34L ) It renders in simdirector properly. However, when I next load P3D, and navigate to that position on the taxiway, the object is displaced several meters to one side. This happens for almost all objects placed on the airport surface.
Start Simdirector ( with command line switch)
place an object with simdirector( taxiway marking) splits the taxiway centerline evenly on both sides.
I export the objects as sxml/bgl, exit simdirector.
Start P3D normally and navigate (slew) to the position on the airport. The taxiway marking is now offset to the left and no longer evenly spaced on either side of taxiway centerline. Placing Buildings or static aircraft seem ok, but they are not at the far end of the runways ( 16R/34L KSLC)
It appears to be related to the lat /lon of the RWY 34L approach end.
See screen shots. 1st image is of simdirector placement.
2nd image is result in p3d.
https://ibb.co/nkpTcJZ
https://ibb.co/BqKtY1V
