Greybeard,
When you abandon a planet you are given the option of scrapping the facilities or not. If you scrap, the planet is left as if you had never colonized it in the first place. If you don't scrap the facilities the planet remains yours (and undamaged) but doesn't produce any resources and won't build anything. To restore the planet to opperational status all that must be done is to transfer pop to the planet via any pop transport or such, no colonizer required.
Geo,
Looks like you solved it. I was using turn based. I seems that happiness is not reset in simultaneous. How strange.
Couslee,
Didn't have to wait a turn. The effects were immediate. See above about the colony ship.
[ February 11, 2003, 06:55: Message edited by: QuarianRex ]