[Daynarr]

Jason, judging from your description that was Xi'Chung defense fleet. This is how AI uses defense fleets:
- they always move only within the systems that AI has claimed
- they always hunt enemy ships, not colonies
- they will attack enemy colony only if enemy ship is orbiting that colony
- if there are no enemy ships in that system, they will just sit (effectively blocking it) on warp point until AI detects enemy ships somewhere within his territory or they run out of supplies.

To take out colonies, AI uses attack fleets. I guess in your case that AI had his attack fleet busy somewhere else.

Unfortunately, as a modder, there is nothing I can do to change it. I can make AI build effective ships, I can make AI produce those ships, but I can't tell AI what to do with those ships. It is hard coded behavior and it is not as bad as it seems. I have seen AI do some very complex things on both strategic and tactical levels and I must say that it is much, much, MUCH better than any previous Version. Of course, there are times that AI looks just plain stupid, but that is the case with ALL games (including chess games).