I blew up all the objectives and escaped to the buoy, but the game tells me the mission isn't complete, because the objectives aren't destroyed. What's the deal with that?
I'm running Vista 64-bit.

In game you can check the book or map to see which objectives you did and didn't finish.
Mission objectives:
-Destroy the radar antenna.
-Destroy the lighthouse.
-Destroy the anti-aircraft batteries.
-Escape to the southwest buoy.
Either 1 of the first 3 isn't destroyed, or you're at the wrong buoy (not sure if there's 1 or more).

Everything *is* blown up, and I'm at the southwest (and only) buoy and the mission still won't end.

Strange. I never had that happen to me.
You might want to try moving the boat around the buoy a little.