Sorry to hear you are having problems. Im afraid I dont recall this problem nor know of any solution. Not being able to reload a saved game postion sounds particulary unusual.
Scenario no 7..A Turncoat Pirate dones ring any particular bells. You must be getting quite good at it. I wonder if there is a scripting bug which you particular method of play is exposing.
Good luck...and ps dont forget to record you scores for each campaign episode. Theres no way to review them at the end. If you post any in the campaign score thread I will update the table. http://dynamic.gamespy.com/~tropico/cafe/index.php?topic=8731.0