Patch Notes of first official patch:
- Dialog banter filter in the combat log

What this means is they added another filter in the dialog box, this is where all PC to NPC conversation go to. So we no longer have to go into the Logbook to see what our coop partner is doing, it will show in the lower right dialog box. What I do is just un-check all other filters and leave this checked. All conversation in game happens in this box, it is better. Perhaps there is an exception or two. I assume this was their fix. I did mention a bug with it in another thread in terms of chronological order.