So...some good news and some bad news.
First, the good: ZoC fix seems to be working after many save reloads. Awesome! Though it wasn't game breaking, it was SO irritating!
Next, the bad: there are now multiple quests that have a very repeatable crash-to-desktop as soon as you complete them:
Bacco the Beggar, 'Trapped Wildlings' and the 'explore the cave' quest all CtD as soon as you complete them.
This happens in both vanilla and modded versions, after the ZoC fix patch. I have a save game ready at winter 170 (just before Bacco's quest will pop), but I don't see an easy way to upload the file to the forums.
Really you should be able to repeat this pretty easily with any new game. Just try completing Bacco's quest and having him join you. Like I said though, I've seen the crash happen on other quests too.
Finally: a feature request. Quick-load. Couldn't we PLEASE get Cntrl+L to quick load the quick save? Please?!?
Anyway...just my observations. I absolutely love this game. It is addictive enough that I still regularly look forward to getting home from work to start up a new game and lose a few hours in it!
Edit: I'm running the latest version, through Steam, on Windows 7.