Okay, I began play as a custom race, with lots of technology and research bonuses, trying to get a step ahead of the competition. I spent considerable time colonizing as many planets as I could on a gigantic map, stil to see the Terrans with more than 75% of the galaxy under their blue borders.
About 2 hours into it, after I have spent a lot of time creating economic starbases around my planets, and some planets, too. I had one Class 26 planet. My approval plummeted from about 60% to 1%. My production, taxes, and everything didn't change, and I made a few adjustments. There were no influence starbases near me that I could find, but I had not researched beyond the Imperial form of government.
I went a few turns trying various things to bring up my approval, then half of my empire defects to form a new empire, and I start really llooking at my approval.
Just about every planet has dropped in population, the stats look fine, except for "native ability" which is
-212335656835097518% or so. Believe me when I say I made that number up. But it is not far from what actually appeared on my screen. It started with a 2 and had about 10 digits following it. Nothing I did changed it. I had to start all over.
That was frustrating. If it was a bug, that's one thing. But if it was something I did, please tell me.