New Post: Using BTDF ProductVersion Build Drop Path

Are you sure that you're executing the Installer MSBuild target on the .btdfproj? In new projects, it's the default (DefaultTargets="Installer"). Older projects might have a different default and need the updated default or the MSBuild command line needs to specify /t:Installer.

I'm assuming that you also disabled output redirection in the build. Without that the WiX project won't be able to find the DLL's for packaging.

Thanks,
Tom