Dear all, On 10/12/2010 05:02 PM, Damien wrote: > Are you using MUMPS? That has fake MPI headers for the sequential > version in IPOPT and that doesn't play nicely with real MPI libraries. > > Damien I just want to let everyone know that removing MUMPS has solved the problem. MPI is working fine now. Thank you, Damien. Cheers, Uwe