Ok, you know the random even that basically says that an empire found a Precursor device on a planet that adds "x" amount to the class of Uninhabited planets within 1 or 2 sectors, or for that star system? Well, their is a MAJOR bug, yet a nice one actually, that occurs when this event happens.

As normal, all uninhabited planets gain the amount of bonus said, but the problem comes with star systems that do not have 5 planets in orbit. Once this event happens, the game will eseentially create planets that are the the same class as the amount of the bonus, as if they were always there. What's weird is that they are actually invisible until you colonize them, then they are only visible when you zoom out far enough to see symbols instead of graphics.

In other words, when said event occurs, invisible planets are created for star systems in the area of affect that do not already have 5 planets in them. (Although I may be wrong in that it may only happen for the event that boosts the class for uninhabited planets on a single star system.)