I just got this game, and so far whenever I start a game, every planet (including the starting planets) is class 0. Population on the starting planet is "5 / 0" and most things will not build. Most planets are uncolonizable, but some of them have special attributes like "frozen" and those can be colonized. I got an ideology that is supposed to create a class 10 planet, but it do not make a new planet.
I also tried the tutorial; all planets were class 0, and the game froze when I invaded the enemy planet (cpu pegged to 100%). I tried loading a map instead of generating a map, and everything was class 0 still.
I think the map generation settings are default, but I couldn't find a "reset to default" button so I'm not sure.
When I try a spiral galaxy, no planets are generated at all, you start with only a survey ship, and every faction is defeated after the first turn. (This was actually the first thing I tried, and it took me a while to try things other than "spiral".)
I did find a post online of someone else with the same problem, but they didn't get any useful replies.