hey Afforess,
I can produce a crash with Fixed Borders. When I have a few units ordered to claim territory and I enter the World Builder, the game seems likely to crash. I'm not sure if this is the specific cause as it does not happen every time you do it. I've had two games become irretrievably corrupt. I save frequently so I can go back and monitor changes and it seems the entire "tree" of saves get messed up. When I try to open them, I receive the "fail to uncompress" message. I tried clearing the cache, but it does not fix the problem. I simply have to delete all the saves and start a new game.
I've finished a few games, going in and out of World Builder at various stages of the game, without experiencing this problem. It only occurs, with a varying degree of frequency, when I enter WB with a few units ordered to claim territory.
I'm sorry I can't provide more information, or if this is a known problem and I've missed reading about it somewhere. But I thought I would bring it to your attention. If I'm wrong about this, please don't spend a lot of time on it on my account. It's not a big issue. I love your mods and just want to help as best I can.
Thanks