DTS + collision bug?

I have modelled a building as a DTS shape. The model is composed of 6 or 7 meshes with different textures. The model exports correctly. However when I try to add a collision mesh to the hierarchy to handle the collisions and export to DTS some error occurs. The mesh refuses to be displayed in both Torque Advanced and ShowToolPro.

I check out that the hierarchy in 3DStudio is ok, and in fact it is. I used the official DTS exporter for 3DStudio 9.

Any Ideas?

Thank you in advance.