As I wrote about on the Omg thread (bottom of page 133) I experienced this bug quite dramatically. Strangely enough, It occurred in Angora. I don't have the initial save (annoyingly). I started an Ethiopia game when I got this annoying bug where save games failed to compress (meaning you also couldn't open them again as it would try to decompress them and give up). I started again, expecting a bug-free game. Whatever caused this bug occurred prior to 295BC. a few turns before I spawned, I was informed that I had failed the Found Christianity UHV. What happened from then onwards, you can see in my post on the other thread...
I've uploaded the earliest save I could get my hands on (295BC) and my latest save (610AD). I think the Byzantine spawn might have killed the bug, cos Byzantium's indie successor in Angora didn't capitalize on any resource burst, indie tech didn't advance and Angora's pop dropped by about 20 points.