This is a small one, but consistant and reproducable. If you go to a planet by pressing the view button or by double clicking it on the colony manager screen and you click on an enemy agent on one of your rescource tiles and then click on the nullify agent button and use your last agent, the enemy agent goes away, but the agent button on the main screen is still red when you return to it, and if you roll over it a pop-up box comes up and states that you still have an agent available. If you try to use that agent, it is not actually there.

Scincerely,
Scintor