1. Improvement Downgrading[/B]. The new addition of old improvements as a choice has resulted in most of the improvements being able to be "upgraded" to a lower level of improvement. eg click Research Academy, select "Research Center" and it happily beavers away effectively downgrading itself - happens with nearly all types of improvement. Kind of a stupid one I know, but could happen to inexperienced players at 3am or just a mistake in selection. It should be programmed to stop "downgrading" improvements in that scenario.
2. Improvement Upgrading. The opposite of the above. If you select an old improvement to start with on a new planet at a time when you have already reseached a superior improvement in the same catagory - eg Factory instead of Industrial Sector so you get some output quicker - that improvement will not auto upgrade on completion and you need to check manually. The latter is impossible as almost by definition its later in the game and you could have 50-200 planets on a gigantic map to check upgrading is happening - cant be done.
3. AI Gifts AI was offering gifts and largess in the usual fashion in recognition of "greatness and power" blah blah. However the AIs were blown away at the time with bank balances varying from minus 700bc to minus 4000bc as a result of the Plague decimating the population (they never recovered after a few agents placed alonside the plague blew away growth). Slightly unrealistic as it was fundamentally a result of the game not yet balanced, but nonetheless they were offering gifts when they had less than the minus 500bc watershed. So maybe a catch all condition could be inserted not to offer gifts if bank balance less than minus 500bc, and that would cover any unexpected scenario / side effect in the future.
4. [B]The Plague Always seems to happen early every game - probably a result of not being balanced yet, but if the latter is not a factor it needs looking at as you can plan in anticipation of it happening and blow away the AIs during it as they have a hard time researching the cure. They probably cant research it at the moment due to balancing of course.
Regards
Zy