Just a glitch I have noticed, and I have no idea whether or not this can be fixed.... If you have one person die and others are at unit cap, and the units are divided between the other players, the factories do not function properly. This also applies to giving another player units in separate groups.
If you are gifted a tech factory and not the HQ, even if you are given the HQ after, you can't build the tech from that factory. It is glitched for the rest of the game. Basically if you forget to select the HQ, or the units are split between two players after a death, you end up with a bunch of completely useless factories.
Again, not sure if this is really an issue or if it is fixable.... just an observation.