I was saddened to see the return of an old v1.2 bug while playing my first v1.4 game.

This is the bug where you finish research that allows you to upgrade a building on the same turn that you complete the (newly obsolete) older version of that building. What happens is that you lose ALL of the building's attributes, but it shows up as built on the tile, in its glorious upgraded form.

Example from my game--I was researching the tech that gives me the Multimedia Center. It finished on the same turn as I completed an Entertainment Network on a planet. Looking at that planet, I see the Multimedia Center icon on the tile, but looking at my planet approval, it does not show any approval/morale bonus for this building. However if I look in the details screen for the planet, it shows up as giving me a 10% morale bonus. Bottom line--no morale bonus is applied to the planet approval rating for this building, even though the tile is occupied.