Yes, in the meantime I've found the answer on

http://sourceforge.net/tracker/?func=de ... tid=784665

(I'm new to the site and I wrote about the problem before reading bug list/status.

thanks,

Damir

Thanks for quick advice.
The above problem was noted only on portable version.
At home, with "normal" Sweet Home 3D everything was OK.

My "Box floor" was 10 cm thick as I intendend it.
I didn't try different colors on my box floor but yes, that
could be a nag. Maybe if I put a normal floor on my ...

I made floor from two "thinned box" forming the upper floor around stair hole. Positioning of furniture on both floors was no problem.
Problem was in coloring or texturing this new floor made from "thinned box" (no color or texture). Normal box is ok, but when I thinned it it became colorless again ...