Zul Drak is a nasty one yes, I died 3-4 times before I could get it right, but the one Im referring to was out in Storm Peaks where you ride the King out to the field of frozen warriors. You dont even have to fight, just go for the ride, but I couldnt see around him at all. I didnt even consider it could be due to my resolution. I have an old rig with a 17" LCD set to 1024 x 768, so that may be part of my problem.
Also, I wish there was a method to see which quests you're missing. Ive kinda become an achievement whore and I have two regions that I havent gotten the quest completions for. One areas is missing two quests, the other only one quest. I spent about an hour flying around Storm Peaks various quest hubs last night and I couldnt find the two I need there.