I've loaded two ahn2 dem's and although I can see the basemap in 3D many white spots appear, also there is a gap between them. What am I doing wrong? Same issue on two different computers/different hardware, so is this a driver thing?
It's hard to tell from the screen shot, but these layers could be intersecting with the ground surface. If 3D layers intersect with the ground surface, it can display as though there are holes. By default, the ground surface's color is set to white. Can you try changing this to transparent and see if this resolves the issue?
Thanks for your reaction. The ground surface color is set to transparent. I have the dem's in my ground surface unlike your screenshot, I try to use them as better (more detailed) surface data than the world elevation3d surface
And the Solution: I had switched off WorldElevation3D/Terrain3D which is necessary...
Formulating this answer got me to find this, thanks for your time!
Retrieving data ...