I noticed a bug when I had queued up a significant amount of tactical structures. Since I had begun working on increasing the tactical cap on the planet, the game let me place additional tactical structures. The system currently had no structures at all. The construction frigate appeared to be working on building the first one, but I noticed no progress being made, presumably it was waiting for the tactical cap increase to be completed.
I didn't get a chance to test this with logistical structures but it may be an issue there as well.