You need to flip the mesh normals so they point outward.

Thanks, fixed it.

Please also compile your files with Studiomdl.

Unfortunately that leads to all edges between verts with different normals being marked sharp. You can see the results of that algorithm here.[facepunch.com] The solution to that involves orthographic projections in order to detect precisely which edge the difference is along, which I've never managed to get working.

Custom normals offer a far simpler solution (and more reliable - who says that Blender will generate the same normals as seen in the model even with sharp edges correctly applied?) so I'm going to wait for them instead.

Blender regenerates vertex normals at regular intervals. It's always been possible to assign the SMD values, and in fact everything shows up correctly at first. But the data is lost when the user starts to edit the mesh. To permanently store the normals I would need to convert them to sharp edges, which is not easy at all.

I'd love to get this working, but I've never managed to properly convert the individual vertex normal values in an SMD into sharp edges.

The good news is that there are currently efforts underway to add custom normal support to Blender that will fix this issue once and for all.

Fixed.

This is caused by having an armature with no bones. It'll be fixed in the next release. Until then, delete the armature.

This happens when a group includes only objects that appeared earlier in the export. I've fixed it and will release the changes in a larger 2.1 update that should be arriving in the next few days.

My test has 17 meshes attached to various bones on the scout, compiled as bodygroups, and works just fine. I'm not going to go any further in guessing what's wrong: I need a repro case.

You can't say that there's nothing interesting in the DMX files just because the importer and studiomdl don't pick anything up from them. I'd like to pass a human eye over their contents.