Newton 2 wrapper

I tried Newton 2 wrapper with A8. In a small test level i have some boxes (mdl) falling to the floor (block). But they are falling through the floor! Sometimes they get stucked, struggle, finally they all fall through. What to do?

I want to build the level with "create meshes" as "simple map".

What could be wrong...

Solved! See: Newton with A8 solved