Beta 4 is looking great but there are still some game-breaking issues mid-game with crashes. There's a good save from wheret the game can be continued followed some 8-10 turns later by 2 saves which always give a crash when going for next turn. In addition, loading these 2 saves and checking the information on the foreign relations produces an empty section - that is probably a bug or save corruption. Also 2 factions that were discovered and show up in the good save are removed from the power status information.

https://dl.dropbox.com/u/95867312/%5B0.95%5DCrash-badsave.zip