Export raster with texture shading from surface quit working

deermap

I have a surface and orthophoto in Global Mapper 15.1.  In December and prior, I was able to export this raster with the shading.  I needed to shift my area, so I just tried to do it again with the same project, and now it doesn't work.  Even if I only have the orthophoto displayed and the surface NOT displayed, the only thing that exports is the surface image.  Any clues?