I've captures some images from the room I am "playing" in.
Right now, I see the following "problems" :
a.) the boxes do not remain stacked when physics become enabled
b.) the color of (some) of the boxes change without reason. They are all the same model, with the same action attached.

Especially the second one got me spooked. I am willing to accept that I have not yet mastered the physics engine, but I was pretty sure that models wouldn't change colors without any reason.
I'm using WINXP / 3DGSPro (6.31.4), NVidia GeForce4 Ti 4200 (128MB RAM) with the latest drivers, DirectX 9c is installed.
Here's the first pic - the physics engine has not yet been enabled (I put a 5 second SLEEP in in order to take a closer look at the level before physics start doing its stuff). All boxes look normal, some are stacked, some are "suspended in mid-air" until physics are enabled.

Next, when the PHYSICS engine is enabled, the color of some of the boxes change :

I also notice that the boxes do not stay stacked:

And some of the boxes even keep spinning around their own vertical axis at high speed, without any apparent "trigger":

Very strange ... anyone with any tips ?
Thanks,
Andreas