I'm getting my first crash (twice now) just after reaching 500 pop on 0.9.4. I put in one pumping station, and start to build factories for my next expansion, and the game crashes during factory construction. It seems like the game crashes as I add the 5 factories intended to support the pumping station.
I tried a third time just building the pumping station and letting the game run for several months. It didn't crash. Then I started factory construction and it did crash. So maybe it's something to do with the calculations done each time a new factory is built?