I don't think anyone else reported this problem, other than the link above, which was after the release of the patch (though that doesn't make it any less annoying if you don't make new saves periodically). Hopefully it will be addressed in the next patch.
How does having a problem half way through a game make it "so riddled with bugs that it can't be played"?
Lynn is the main moderator for the forums, among other things, and probably the person who will answer your email to support. The forum FAQ doesn't seem to address sending private messages...
If you need to do so, the easiest way is just to search for a post by that person (such as
Divinity II Support: patches and updates), then click on their user name and in the menu that pops up, click on 'Send a PM'. Fill in a subject, add a message, possibly with a link to this topic, and hit Submit. This basically starts a forum topic which only those you specify can view, and they get a little mail icon in the top forum menu to show they have unread messages.
