Never come across this before. I have a large prop around 1024* in source units compiled. In hammer it appears as a small white box in the model browser. If i place it in the level it shows up correctly in the orthographic views including textures but the bounding box is feckin huge. The model sits one of the bottom corners of the bounding box.
The model is also not viewable in 3D views.
This might be quite a common thing, might not, i have no idea. Anyone?