In the quest "Unseen Visions" you collect the scraqer / knife thing, get moths to follow you, return to the beam of light to read the Blood Scroll ... and it just sort of opens like a normal book would (though invisible) where it SHOULD do an animation of opening the scroll and getting some flashy graphics, then opening the other two scrolls, then progress the quest (to an attack from the opposing faction, IIRC from my other playthrough)

Both the BLOOD Scroll and the SUN Scroll in my inventory open incorrectly, whilst the Dragon Scroll works fine.

*EDIT* This is on my second playthrough, this time siding with the vamps

one is listed that when in VL it removes vl powers from the favourites tab when feeding.
this actually happens just anytime i go into VL an return to normal. all my powers and shouts are reset and missing from my favourites tab. its extremely annoying having to do it again 10 minutes. i thought i was mistaken but ive jus tested it an no powers or shouts remain in my fav tab. i kept putting histskin in my fav but everytime i tunr its gone same goes for any shouts. it makes no difference wot you do. it happens when you change forms an then back to normal

Type of Bug: General.
Quest: Speak with the Leader of the Dawnguard.

I can start the quest, and get the overworld map marker (but no compass marker) for "Speak With the Leader of the Dawnguard," There is absolutely nothing at this marker. I've looked everywhere and am standing right on top of it.

I can see Fort Dawnguard on the world map (but again, no compass marker.) So I try to go there, and reach the end of the world at the gate where the road leading to it says, "You cannot go that way." I've tried to circumnavigate it every way I can imagine, and I always get the same thing: "You cannot go that way."

Version: Xbox 360 1.6 title update w/Heartfire and Dawnguard installed.

What I have tried: Deleting title update and redownloading. Deleting Dawnguard, redownloading. Deleting Skyrim, all DLC, and the title update. Clearing cache. Reinstalling, redownloading DLC, reupdating. Ensuring that the Add Ons are properly listed (they are.) Loading previous saves (I have hundreds and have tried at least 50.)

Nothing works.

This happened to me too, but it occurred after I asked Serana to make me a vampire lord (then I swapped back). If what you are saying is accurate, it sounds like this is a MAJOR glitch with Dawnguard, one that kind of ruins the whole werewolf/vampire choice anyway. The only way to get rid of the negative stuff is to have Serana turn you into a VL and then get Falion to cure you.

Sigh... how does a bug like this slip past detection? I mean, didn't they have people beta test this dlc for crying out loud? XD

Serana randomly starts attacking with ice spike / icy spear spell (not sure which, they look the same), and won't stop, even with no enemy or a corpse. Happened during Touching the Sky in the Inner Sanctum and at the battle with Harkon.

Also, in a separate playthrough, I got the audio file of the sound of this spell being cast repeatedly, without any accompanying animation, endlessly. Every reload of that file restarted the audio, had to boot up a previous save to get rid of it.

Bug type : Graphical

Whenever I fight Falmer, my character turns invisible on and off constantly. It happens strictly in the third person so far as I know, but it is extremely annoying to be popping into and out of view as you are fighting what I would say is one of the tougher enemy types in the game.

Bug type: Gameplay

There is a bug that will cause a copy of Drain Vitality to appear on a character. The copy has Marked for Deaths words of power but then has descriptive text that pertains to Drain Vitality (it says "drains 1 health per x seconds, blah blah). When using this shout, there is no sound, but it functions like Drain Vitality.

When shooting Auriel's bow into the sun with blood soaked arrows the sun turns blood red(as expected),but then goes back to clear skies within 15 seconds.Shooting Auriel's bow with the blood soaked arrows in the Forgotten Vale will not affect or carry over to the skies outside of the Vale .You'll need to shoot another blood soaked arrow outside of the Forgotten Vale(Skyrim) to turn the sun blood red,but the sky will again turn back to normal. NPCs will still comment that something is wrong with the sun.Stamina will regenerate as a vampire.

My level 54 female wood elf vampire has a red line from her nose to chin. She did not have this before becoming a vampire in Dawnguard.
She also has the # 9 Graphics bug - bald head with the Thieves Guild hood.

Type of bug: Gameplay:: Whenever I try to talk to serana she attacks me until i down her. When she gets back up I try talking again to no avail. I cant even tell her to go away! Edit: It stopped after I reloaded.

Odd, since it has only started happening within the past week or so, but I'm getting a lot of game freezes. I have the game installed to the xbox HD, along with Hearthfire and Dawnguard, and now I'm getting freezes on exiting buildings/caves. Happens two or three times a night now, so I have to get up and press the xbox power button several times to shut the system down.

Welcome to the club, I have had this ever since DG and Patch 1.7 and nothing seems to fix it , turned off autosave, reinstalled, nothing works, cache clear etc.

Wow that's quite a scary list of bugs i hope that patch 1.9 starts to adress dawnguard problems ...

I found a bug but it's only minor though. I found 2 bloodstone chalice's In a chest in castle volkihar. They are dropable and sellable but just thought I would post it because there is only soppused to be 1 bloodstone chalice that you can't even pick up at all.