Duplicates: T35839

--- Operating System, Graphics card ---
Win7 64
Intel pentium 2.3ghz dual core
Intel HD gbraphics (mb integrated)

--- Blender version with error, and version that worked ---
Blender 2.67B
Blender 2.66A worked

--- Short description of error ---
reversal of boolean

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
Create a complex non geometric shape, nonuniformed, such as a car body. Then create a cylinder, deform it like a teardrop, then use a boolean modifier on the body, set to difference of the cylinder. The operations have reversed to a difference performing as a union. The union will act as a difference.
Able to reproduce repeatedly with complex shapes. Not present in 2.66a or prior.