I played a game with both Capital and Occupation victory conditions on against 7 AI.

After a while, the occupation victory display (shows Neutral when no one as settled or a countdown) disappears and it is impossible to win through occupation unless you save, quit and load your game back.

Countdown seems to work as loading a savegame after victory would be achieved results in having the victory screen popping up immediately.

The display seems to take a while to disappear at the game beginning, but later in the game it is gone in less than a 30 seconds.