In the quest
With Friends Like These...
DO NOT KILL
Alea Quintus
If you do, the blood on the ice quest will never start. The guy will just keep telling you the house isn't available yet due to an incident. There is no fix for this. How the scripters have this character tied to the characters in the Blood on the Ice quest, I don't know. I just know I saw somebody post this and since I was having the trouble, I started a new character and checked it my self. It's a problem.
My first (main) char who'm I plat'd the game with just had to do without that house. With over 150 hours in that char, I have been to windhelm hundreds of times and all times of day and night. It will not trigger. I stole the key and it will not trigger. The people that keep saying it will... just don't realize that for some, the quest is dead and can't be fixed.
With Friends Like These...
DO NOT KILL
Alea Quintus
If you do, the blood on the ice quest will never start. The guy will just keep telling you the house isn't available yet due to an incident. There is no fix for this. How the scripters have this character tied to the characters in the Blood on the Ice quest, I don't know. I just know I saw somebody post this and since I was having the trouble, I started a new character and checked it my self. It's a problem.
My first (main) char who'm I plat'd the game with just had to do without that house. With over 150 hours in that char, I have been to windhelm hundreds of times and all times of day and night. It will not trigger. I stole the key and it will not trigger. The people that keep saying it will... just don't realize that for some, the quest is dead and can't be fixed.
This doesn't break the quest. Something else does. I have not done any Dark Brotherhood quests and the quest wont trigger for me. It's something unrelated.

but keep u the good work!! we are making much progress!!!