Yep... I got this one after restarting a game with a tiny map. I decided I wanted a few more planets on the map so I restarted the game by clicking Options->Main Menu->New Game. I changed the planetary settings (stars, planets, habitable) from common to abundant. Everything else was the same as the previous game. Well when I started the new game it took me a turn or two to realize something is strange about my home system. It has 3 habitable planets instead of the usual 2. Also my home world is set to radioactive.

I've already emailed in the save file along with the accompanying debug file.

Happy bug squishing .