While the UP Resolution: Galactic Domain ( BlockColonizationInOtherPlayerZOC ) is active the AI players will not colonize new planets in unclaimed space, not just space claimed by another civilization.
The techs that are supposed to reduce the manufacturing cost of ship defenses have a positive instead of negative multiplier value (for example see HighEfficiencyDeflector). There are multiple places where signed 32 bit integers are used without overflow checking. Items I've identified so far: treasury credits, total production per turn of wealth, manufacturing, and research. I deliberately created ridiculously overpowered improvements to be able to test this, but in a very l
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