I have been having some wall join issues with Revit in general (2008 or 2009)
with reference to wall joins from phase/existing demo to new; wall joins aren't sticky or join incorrectly, changes "away" from a join can cause a corner to fly apart, or where windows/doors exist and are demo'd, there are a whole plethora of problems that can arise.

If you have direct experience managing problematic wall joins in this typ. of a project, I'd like to hear from you. I really don't have any more time to guess my way through hypothetical possibilities because of all the issues I have experienced. Anyway, I've tried all manner of fixes and work-arounds.

In the end, I find myself considering breaking off the new phase of the model from the prev. phases so that I can work freely, without any further drag.

Big Thanks in advance.

Bill