Issues with GroundWiz Terrain Map
Please check the online version of this manual for the latest update: http://groundwiz.gugila.com/man/gw_manual.html
After rendering, GroundWiz viewport texture disappears.
This problem is likely to appear when using DirectX for viewport rendering & if textured terrain is not using UVW channels to show viewport texture. Problem is not serious, if you click on your terrain object or have it selected in the first place then the texture will show up. This problem was resolved since version 1.280.
Displacement doesn't work or looks bad.
Check global displacement settings for your renderer. In case of mental ray, 'Edge Length' should be small enough (for example 1.0) and 'Max Level' parameter probably quite big (exact value depends on your terrain mesh).