NOTE:: Revit Bug- Wall sweeps are not cut by objects in a joined wall.
Revit Bug -
Wall sweeps will not cut in joined walls... So when a window is hosted to the exterior wall(shown below) the sweeps on the interior wall do not cut around the opening. Doors and windows hosted to the interior wall in the example cut the sweeps.
So for now for the upcoming submission- if you run across this come find me so we can work out a solution on a case-by-case basis.
If sweeps are not used (i.e. the wall materials are split) everything cuts ok- but doesn't always clean up that well
(Although the 64 bit version seems to be much better at joining than the 32bit.)
The same wall sweeps are cuttable when the cutting object is hosted.