Playing a small game against the Iridium Corporation and I conquer all their planets but Iridia. It has a huge population (over 37 billion). I have tried everything I can think of, filling the transport to 10 billion, and well what else can you try? They have no ships showing in orbit, I have researched all military tech related to invasion. The invasions are not failing, they are not initiating. I click on the planet and my transport just stops as if there were defending ships in orbit.

Unless there is a feature that somehow protects a planet from any invasion, it has to be a bug. If it is just a beta hangup that's fine but this is what I mean about the end of 4X games being tedious. They should have surrendered many, many move ago. It was never meant to be a very challenging game and The IC never had a prayer, yet they require me to conquer every last planet. Even if the invasion had proceeded on the first try, it would have been too much.