Please upload your Blend file.

Try making your meshes children of the armature in Blender. Then everything will share the same co-ordinate space.

Yes, that is entirely unsupported. I have never seen DMX encoded with XML before. Where did you get this from?

Looks like an up axis mismatch. If you have the $upaxis command in your QC, beware that it only applies to models defined AFTER that line.

I can't download your file and can't reproduce the issue locally, so I don't really know what caused this. But I was able to put some checks into the code to handle things being unexpectedly null.

Please upload your blend file.

Fixed in 3.2.5

Whoops, this will be fixed in the next release.

I made some progress before getting tied down with other things. I'll get back to it this evening.

How is your physics model rigged to your armature?