Team Foundation Build Won't Build

Question

We had a working build for our solution, but when we added a new project, it stopped working. The build runs "successfully" and the log shows: Run MSBuild for Project -> Built [my solution] for target(s) publish (same for all projects), but it doesn't actually build anything.

The problem seems to be in the build configuration. My build process definition is set to build for my custom configuration (ForMSBuild | Any CPU), but something is wrong with the way TFB is interpreting that definition (I need that custom configuration because I copy some .dlls to a designated folder to include in a publish process in order to be available for a ClickOnce install).
At one point, only the new .dlls added to the solution weren't building (even though they were listed in the Configuration Manager with the Build check box checked). So I re-created my custom configuration, ensured that all my .dlls were checked to Build under (ForMSBuild | Any CPU), and now none build. I have opened the source on the build machine directly in Visual Studio (2012) and verified the settings for my custom configuration.

Answer 1

It turns out that I actually had the main startup project not checked to build. Really stupid mistake, but I sure wish MSBuild hadn't spit out all those incorrect messages.

Answer 2

Edit the Build Definition, in the Process tab click the ellipsis next to Solutions To Build, go to the Configurations tab and ensure TFS Build is set to build the configuration you want it to: