I think Larian should make a big patch about the quest issues, and they should make the quests clearer and more to the point, i know it's fun to figure out what to do by ourselves, but it's anything but fun when you break the quest by accident somehow and never manage to complete it. I had to proceed without Gareth to Act 3 because he was lost. I couldn't complete Fane's storyline because it was bugged.