Maybe an invasion bug?
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Stardock Forums
I haven't tried this with 1.03A, but I did have it happen with a 1.02 game. I was invading a heavily defended system, so I used Mass Drivers to help even up the odds. I still lost the battle, but I killed billions. The potential bug is that there was no planetary damage done. No building destroyed, nothing. I easily mopped it up with my next invasion, and had no lasting damage from what I did. So, the question is - was it a bug, or were they able to sacrifice enough people to keep my mass drivers from damaging their planet? It seems like a bug to me, but I can understand the other side of the coin as well. It can certainly be exploited if people wanted to. Anyone have any opinions on the matter?