imagery offset in 3d pdf

AndrewB

I have created scene which involves a geoTIFF draped over a elevation grid and then with some clipped las (tree) as another layer.  This scene visualizer perfectly in plan and 3d views within global mapper but when I export the scene to a 3d pdf the overlaying raster layers are offset from the point cloud data.  This offsets varies in intensity depending on the area selected to create the 3d view.  What am I doing wrong.