In all honesty I've never made it that far.
I have to say it doesn't sound good. You didn't say if you made these changes in port or not. Because if you didn't do them in port it might explain the corrupt saves you've got.
Also, does the game run ok if you load a new career?
Ram is a big issue with this game - although it really shouldn't effect your game in this way.
Hopefully someone will be along who can help more
|