This is interesting since the same problem occurred on one of our computers for 6v0 and 6v1. MODELLER 6v1 is compiled under Read Hat 7.2 and this is the first complain that came from the MODELLER usage list. I can try to make you another executable. It will be from Red Hat 7.2 / 2.2.14-5.0.14smp kernel.
Had anyone else experienced this?