Doing it now =(
I really hope it can be fixed, since I really start liking this game. I think they though, should add some improvements and new unique features. A Multiplayer Online Campaign would really be such a thing, it would make the game as good as unbeatable.

yes, they are working on it, is something linked to siege weapons, is difficult to analyze it. To me happened with particular graphical settings. I send them your files.

You said it was with particular graphic settings. Does any certain combination work better, so that the game wont crash at the siege?

I don't know, every PC is different. Anyway this is one of main issues remained, so they are working hard on it for find the problem cause.

Any idea when next patch might come out? They released the first one impressively quick after release, but Im really looking forward to next since it'll hopefully fix the siege bugs so that I (and probably many others) can continue playing the campaign.. ;D Without crashing

Next week, there will be also many additions to gameplay and campaign, not only corrections, but perhaps for siege weapons problem there will be before a hotfix, when corrected.