Watching the Dawnguard forums for the month or so that the 'Boxers had it before us, I noticed many complaints about high-level vampires going berserk inside cities and killing important NPCs.

Is there a mod out yet that curbs this problem? Or is anyone investigating how?

I played it on the 360 and that was a major PITA. I can't tell you how many times I had to reload because some Master Vampire killed important NPC's. I hope it's fixed soon.

http://skyrim.nexusmods.com/mods/21615.

If this were Nexus Network, I'd give you a kudos.

Whatever dev thought this was a good idea needs to be smacked with a slaughterfish.

These modders were quick. Now expecting incoming Serana marriageable mod