I've found a game-killing bug (unfortunately).
In my current game (latest patch) I have apparently encountered a bug that causes my planets to lose their ability to build military projects.
I have 2 colonized planets in the Sol system (Earth being 1). One of the colonies finished a corvette, and I was automatically taken to the project screen to choose the new project, as usual. But there was no corvette or anything else already in the build que as there is supposed to be. It was empty. I could click on ships listed, but they would not appear in the space below that shows what is being built. No matter what I click on, it remains emptly.
I can still build social projects just fine.
I've tried saving and reloading and the problem remains. I kept on playing for a while hoping it would go away, but the problem spread to Earth! Now Earth cannot build military projects either.
There's really no way I can win the game now (I only have 4 planets). I'll send in the save game if need be. I hope this gets fixed in the next patch.