I was playing a Rebellion game vs. the AI. I won, and chose to keep playing. Not long after that (like within 1 minute), The game crashed. I looked for a mini-dump, and see nothing in the indicated temp directory.
After relaunching the game and loading from an auto save, I was not able to reproduce this crash.
I should also mention that the AI was acting very strange. I was expanding my empire fairly slowly, being methodical. The AI only took a very small number of planets and had no fleet really.
I'll try again to reproduce this crash tomorrow