I hadn't seen that with meshes I've imported so far.  I suspect it was some problem specific to that mesh.  What app originally exported it (if you know)?

Cinema4D Plugins (Home of Riptide, Riptide Pro, Undertow, Morph Mill, KyamaSlide and I/Ogre plugins) Poser products Freelance Modelling, Poser Rigging, UV-mapping work for hire.