I am simulating 2-area system (by Prabha Kundur) in Power System Toolbox (by Graham Rogers). For the default location of fault, the simulation runs correctly using s_simu driver but if I change the fault location to some other bus, the simulation stops at the time of fault occurrence.
Have you simulted symmetrical faults at some location other than Bus-3?
If you have, did the simulation complete till end?