In past games I've been hunted by the problem that at some point newly created ships would cause a single error window per built ship on a construction turn, causing them to come out of the factory without fuel. It was not a threatening problem, as I could just refuel them after, but mysterious.
I've now found the reason for this, as in my current side game fuel is suspiciously rare, so I could observe the situation more closely. The first time that this error appeared again was exactly when my fuel reserves hit the magical 2^31 barrier. My home planet has around 2.3b fuel currently, and after building some small unit, there was the error. The error disappears when I lift away over 500m liter with a tanker, so this is securely confirmed.
2.15b fuel reserve is not that much of an achievement for a planet. This time I got this with running 12 fuel platforms of 400 harvesters each, and those barely feed my single main freighter group, which only has a total of 100 holds (really not that much), yet consumes around 100m+ liters per single trip. (I experimented with "Clipper" designs, express or emergency fast freighters who have 50% tonnage as engines. Surprisingly expensive, didn't expect that.
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