Swamp Issues

[CreepingTerror]

I'd just gotten to the Free Islands, and discovered that it was a bit harder than I expected. So I headed back to finish off the Marshan Swamps. Unfortunately, I can not enter the swamps, no matter what I do. The game crashes after the load without fail. I've gone back as far as I can in my saved games, but none of them will let me enter the Swamp. I can enter it if I start a new game, which leads me to believe that I somehow screwed up the swamp.

It's incredibly frustrating.


Update. Apparently the Old Royal Castle is corrupted too. Sweet.