Popular topic, and I've touched on it a few times in the past, and need to revisit it.
In my model seed file, I created a cube, and applied a material, so that MassPropWeight would be created. Then I created the attribute DB_DWG_TEMPLATE_MassPropWeight, and added it to the Attribute Template. ON my drawing, I populated the weight block of the title block with the appropriate attribute, but things aren't happy.
Looking for thoughts.
Images of what I have: