@nightingale One of your contact packs, the FieldResearch, is generating errors (spamming the log), see this image: I took a look, and it appears the errors are coming from the HardScience.cfg.  When I looked into that, I saw: scienceSubjectsTemp1 = DifficultScienceSubjects().Where(s => s.Biome() == @biome) scienceSubjectsTemp2 = @scienceSubjectsTemp1.Where(s => s.Situation() == @situation) scienceSubjects = @scienceSubjectsTemp2.Where(s => s.