I'm at ACT II on a new playthrough. Several bugs that I reported seem to have been fixed: the Duergar boats are back where they should be instead of on the shore, I can see everything in the trader inventor with a controller, and arrows are not passing through houses anymore. A couple of nice twists have been added to dialogue with companions also.
So far, this is the first patch since patch 2 that has improved the game for me.
