problem with quest Supply and Demand

[Reaps1990]

well i ended up killing the Leader of the thugs before starting the quest and now my journal log is stuck with. "trying to deal with the leader"  i would say by being dead the leader is dealt with but i can't finish the quest

[sepe]

I think best bet would be to load prev save (obvious) and go from there. Cant do much about it.

[PBJam]

looks like this guy is having the same issue:

 

http://forums.obsidian.net/topic/74389-multiple-quests-unable-to-complete/