Terrain Presets problem in Build 17

[CarlS]

Presets are not generating viable terrains in Build 17.

Steps to Reproduce
(1) Start the program
(2) Under the General tab, click on Terrain Presets > Canyons > Simple and Fast
(3) Click the Generate button
(4) The program processes the different layers of the terrain
(5) When complete, the terrain display shows a pure black void
(6) The mouse position indicator at the bottom shows normal numbers for X and Y, but Z equals –1.#J for any mouse position.

[cajomi]

It is a bug, caused by the changed smoothing filter. The value of -1 produces inf. results. That affects in general the smoothing filter, not only the presets.