The latest build (20060124_2200) for Autodesk Revit Building 8.1 was posted today. In her post at AUGI, Tatjana Dzambazova (Autodesk Revit Building Product Manager), wrote:
The new build is primarily a service for the localized versions of Revit Building 8.1. There is one additional issue that has been resolved for the benefit of all users; the problem that the wall join on one end of a wall changes when the other end of the same wall is edited.
You can download this latest build Build 20060124_2200