You were right, I had to rescale the objects. It even works for sketchup props. Great!

But I now find myself in another hardship, POSER is really difficult for beginners:

the textures look fine, but once rendered, they go awkward. 

Funny triangles and weird blurred lines appear. What the hell is happening here?

I think I need a lecture on mapping and texturing because I can't seem to find the answers in the manual.

BTW: thanks a lot for the time and patience you put in helping, I'd be stuck without your guidance.