>>Ctrl+Shift+B rebuilds the entire solution (not a specific project). If 'Build' isn't checked in the Configuration Manager for that project in the current configuration it might explain what you are seeing
>
>In the project where it is not working, Build.BuildSolution is indicating Ctrl+Shift+B in there. The settings are the same for all projets. However, there is something making it not working in that particular one.

Shortcuts don't apply to specific projects. They're either global or for specific parts of the IDE.

But I'm not clear on whether you actually checked the 'Active Solution Configuration' in the Configuration Manager.....