well, the next step isn't very pretty!! what we need is a small, standalone program that shows the symptom. the best way to get a bug fixed is to provide a test case that is small and easy to duplicate the problem. there are a couple of ways to do this; what i generally do is comment out half of the file and do a binary search to find the offending code. several folks on the fortran list are very good at this, provided you can send them a tarball of the code. you could also run the f951 under gdb and get a backtrace. but, a test case is a lot better to work with. HTH, bud