Found a name that isn't loading properly, causing any string containing it (including empire names and tooltips) to not load.
Traced it to this entry in mammalian_new.txt. Changing the "í" character seemed to fix it.
Code:mithorn = { name = Míthornese plural = Míthornese home_planet = Míthorn home_system = "Míthorn Var" name_list = "MAM1" }
I think you might've solved that darn bug that had been eluding me for at least a year! I even traced it to mammalian_new.txt but I couldn't for the life of me figure out what was wrong. Seems like that character can't be read properly or something like that. Thanks for figuring it out! Will definitely be fixed in the next update.