Hi, I'm new to this forum. I've been using Sketch UP 7.0 since May of this year, and right now I'm trying SU 8.

I was following this tut

Slicer3: Make physical site models fast

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(sketchupdate.blogspot.com)

Yet I'm stuck, I can't make it work. I load a map, make it curve (toggle terrain), make a box and place it in the map, click 3 times on it, selecting the box and then I click Intersect Faces > With Model. After that apparently nothing happens, the box is cut, but not like in the tutorial. I explode the group of the box and select the faces and delete them, yet it doesn't work as it should. I then try using slicer 3 but it says that its not a solid object. Does anyone as any idea of what I'm doing wrong. Below some pictures:

Anyway, thanks in advance