Build macros no longer working after upgrading from VS 2003 to VS 2005.

I have a long and arduous deployment process set up, and although it
took me a while to get all the kinks out, it was all finally working
just great for many months.... and then I upgraded to VS 2005.

Part of this deployment process involves building my solution
(obviously) using a macro. The code I use to do that looks like this:

DTE.Solution.SolutionBuild.SolutionConfigurations.Item("Release").Activate()
DTE.Solution.SolutionBuild.Build(True)

...again... this worked just fine... for a long time.

But now that I'm on 2005, it doesn't seem to want to work. And that's
not to say that it gives me any errors... oh no... that would be way
too convenient.  It just runs, but doesn't really do what it's supposed
to. After running the Release Build (which I double and triple and
quadruple checked is set up properly) it only builds SOME of the
projects in the solution. The remaining projects just don't get built
at all (and yes, those projects are included in the Release Build in
the configuration manager). It's the same projects every time that
don't build, and I can't find a way to get the build to actually build
my whole solution.

Now... if I manually build the solution by changing the build to
"Release" and hitting the "Build" button, then all those projects get
built just fine... it's only when I try to run the Build from code that
it doesn't work.

..anyone got any ideas on how to fix this?

WATYF