Ok... basically, I was playing a research heavy game only on Earth, and had only Earth, but after 75 years or so, it seems like whenever I either get new officers, or they are promoted, it is a getpromotionscore overflow error 6. I have tried removing officers to an extent, but that did not seem to help. Though not game breaking per se, it still is rather a nuisence, so... right...
BTW, this game is just crazy with the epic level of complexity it has for the topic, Kudos to Steve.