I don't know if this is related, but... If the obj in question is one that you previously loaded OK then it is something corrupted or moved since last using it. If it is a NEW obj that you downloaded, it might have been altered to remove copyrighted material - in which case you need the original objs on your system and need to merge the data, and create a new combined obj that has the full information. I'm still new at this myself, so don't know the exact method, but the theory is appropriate.