If you install the two patches on page 1 (the last two download links) and my fix on page 47 post 934 you game will be stable and nearly bug free in campaign when you start a new one.
If you are interested i can give you a cheat that adds 40000 gold. This should help you getting started in a new campaign, but be sure, once you know how to do it, you might use it too often and destroy your fun