[DavidG]

Same reason as mine I think. I think maybe there is a bug in the game when ships try to move near planets.

I had a fleet attack a plant with capture planet orders. I know I had all the strategy stuff right becuse the fleed had taken many planet in previous turns. This turn they approach the planet and get close to the moon in between my fleet and the occupie planet and then all my ships just stop and wait. Next turn the planet was captured.