Board Thread:Skyrim/@comment-124.181.69.125-20140108055731/@comment-24384528-20140108120748

Looks like some mod is not liking the quest.

A couple of questions:

Do you use UFO and/or Deadly Dragons?

Any mod that messes with NPCs or Markarth?

Mods that you have made yourself in the CK (If so, what version of the CK)?

Cleaned mods with TES5Edit(including your mods)?

Have you tried (or are using) the Unofficial Skyrim Patch?

If i remember correctly, Deadly Dragons have an option to make Followers and some quest-related NPCs essential (cannot die, no matter what) this makes many quests go insane, avoid enabling this option at all costs.