Rendering has nothing to do with it, something with program generated bricks made macs think there were actually 2 lines instead of one here and there, and for a BLB, this creates a SERIOUS problem
Ooh boy! It is fixed! Try it out.
OH MY GOD I CAN'T DESCRIBE HOW HAPPY I AM!
EDIT: Could you make the brick 2x4x5 or 3x3x5? It makes nearby bricks look like crap.
EDIT2: I plan on making a separate face print pack for those who want to put a face on it. When it is finished, mind putting it in the OP?
EDIT2.5:
http://www.mediafire.com/?qj825ga2bnl7cwo Done! If you find anything odd in it like DS_Store, remove it and PM me the link to the cleaned version.