I am using the Intel Fortran Composer with the MKL library. I am calling pardiso to solve a sparse system of equations. Everything was working well in OS X using the -mkl=parallel option with the compiler update of m_fcompxe_2013.1.119.dmg or previous versions. However, the results provided by pardiso are wrong now for newer updates. I incidentally changed the MKL option for -mkl=sequential and I was surprised to see that results were correct as before. So, my question is: what is going on? I should add that this problem is not happening with the Linux and Windows versions, where the -mkl=parallel option is working well for all compiler updates.