@ BlindPete
It seems strange that TOPO has a display 3dTerrain (DEM) or 3dbuilding (gmap3d),or which may render the 3D Terrain/3dBuilding of other map (CN)
Try disabling the gmap3d.img or DEM and see if it behaves the same.
If you post a screenshot we can better understand.Tnx...
Bye,bye
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