Other than that, it looks like you may be running into a problem where the boolean operations don't quite work as expected right now when one of the objects involved is an open surface instead of a closed solid.

Yes, I can confirm this. I was trying to make a threaded screw. I swept a circle along a spiral curve, then tried to subtract it from a cylinder. But, when I tried to do the boolean, it didnt work. I looked at the ends of my sweep, and they where open. I selected the ends and closed them with 'planar'..then the boolean worked perfectly.