Michele:
I opened a blank ArchiCAD 9 file, loaded only the ArchiCAD Library 9, placed one instance of the MSA_W_Shape, and saved an archive file. I then opened this file in ArchiCAD 10 (and extracted the library to folders), and the object was a "bur". I then placed the
MSA_Steel.txt in this library, same result. So on a whim I moved a copy of
MSA_Steel.txt to the ArchiCAD 10 application folder, so it was in the application folder structure the same way as ArchiCAD 9, and the object showed up. You might give this a try, I don't know if the module part of your work flow is an issue.
David