I found two bugs in one game after upgrading to 0.77: Both can be seen on the screenshot below.

1. Map generation: The world was divided into probably two continents. I was on one and it seems every AI as well, so I still managed to win by conquest.

2. Defeated AI leaving buildings behind: One of the AI was defeated early in the game, but there were two outposts and a city left behind, which couldn't be destroyed or conquered. When I tried to build next to it there the game told me that I cannot build so close to an opponent.