Hi David.
Nice catch on the uninitialized variable in AeroDyn. I’ve fixed it in my version of the code.
I have previously spent some time trying to track down the seg faults with gfortran–it’s a daunting task because sometimes the seg faults move when I add print statments and sometimes I track one down to a segment of the code that cannot possibly be what’s the actual cause of the problem. For what it is worth, I have been able to run the first 18 FAST CertTests (all of the ones without HydroDyn) using the grfortran executable, and I am told that the HydroDyn stand-alone driver runs when compiled with gfortran.