Following up my previous message, this from https://gcc.gnu.org/wiki/GFortran/News#gfortran_4.9.1 indicates that the problem is due to the GCC upgrade from 4.8 to 4.9:
Module files: The version of the module files (.mod) has been incremented; additionally, module files are now compressed. Fortran MODULEs compiled by earlier GCC versions have to be recompiled, when they are USEd by files compiled with GCC 4.9, because GCC 4.9 is not able to read .mod file of earlier GCC versions; attempting to do so gives an error message. Note: The ABI of the produced assembler data itself has not changed: object files and libraries are fully compatible to older versions. (Except for the next items.) -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
