im not sure about this... seems like ive loaded some stuff that was really big and it worked out fine then ive loaded stuff that was all messed up like you say about the stuff youre making i think it has to do with the program thats doing the modeling do you use rhino? if you then i remember seeing something in the rhino forum about this kind stuff there was something special that you had to do before exporting if you use rhino go check out their forum here and look around,it was a very recent question pertaining to this i hope ive helped a little anyway...... cheers!