Loosing header file - Debug vs Release, InRoads SS2 c++

 We try to modify sample_app for PowerInRoads SS2, c++ apps.

By changing configuration, we have this behavior: header file SCadFTR.h seems to be lost ?

We can build "sample_app", but, just in debug mode. Any clues on what append ?

Just InRoads, Visual Studio 2010.

Thanks

-Hugues