Step to reproduce:

1. Create a new QApplication project with the default settings
2. Right Click on mainwindow.h -> exclude from project
3. Check the Show All Files button in the project explorer
4. Right Click on mainwindow.h -> include in project

This is a minimal example, but in all my projects if I try to include an header with the Q_OBJECT macro visual studio crashes

 I've attached a debugger, and the crash is due to an Access violation reading location 0x0000000014 from VCProject.dll

I've attached the dump saved at the crash moment.