Ok, this is all very exciting. Added
-fexceptions to the make/local file, but not really sure if that was what sorted it out. But if it works, it works! ¯_(ツ)_/¯
Overall CPU-load is around 25% (have 6 physical cores, 12 hyperthreaded). Time to start reading the manual on threading and try bigger models! Thanks for your help @ahartikainen.