For me I've only had it happen in the beta--But if you say it happens pre-beta then I think that it's some thing that should be high in the need to fix list because it can be a game stopper (aside from it being annoying).
Sevenneves
Nope, I've had the same if not a very similar problem in the beta--for some reason the computer won't take its turn. The only work around is to look for ships (of your own) that haven't expended move points and then have them all use their move points and only then will the computerl take its turn (most of the time, other times I have to revert to an earlier save).
This is why they shouldn't have the UPN meet every year and they shouldn't have elections every three years--They NEED to start measuring things in terms of game turns--As it stands things are ridiculous now. Have an election every 50-100 turns have the have the UPN meet every 50-75 turns; this is how you scale things so there's consistency for players not stupid years that cause fluctuations in turns. This is the one thing that annoys me the most abou