Linux, SVN1063, Opengl.
On the left side, a .md2, on the right side, a .b3d, both with setDebugDataVisible( irr::scene::EDS_BBOX_ALL );

Seems that Animated Meshes (tested with .ms3d and .b3d) with bones don't update their bounding boxes.
Sometimes, the mesh goes really far away from the bounding box.