The problem is that vampire attacks are slaughtering people in all the towns -- often without me even seeing it happen. I've been playing with Dawnguard downloaded for about 10 hours and about a dozen named NPCs in Windhelm and Whiterun have already been killed in random vampire attacks (that i know of). I say this is game breaking because I'm pretty sure if I play 20 more hours there will be very few named NPCs left, which svcks so much of the lore, atmosphere, and radiant quests out of the game.
I don't know that I would have a problem with this if the deaths were at all avoidable, but it's always one of two scenarios, so I'm wondering if folks have workarounds for these:
1) I fast travel somewhere and an attack is underway almost immediately after I arrive. By the time I can even run in close enough to attack the vampire, one or two named shopkeepers have run in to attack him and are killed instantly in just one hit. In this case I just reload the last autosave and avoid going to that town for a few days. It's a frustrating workaround (in that it randomly forces to put off certain quests for long periods) but I then found out this doesn't work because...
2) Even after I started just reloading every time this happened, I periodically get couriers coming to me delivering inheritance letters for NPCs that died -- but I never even saw the vampire attack (I assume that's what it is) transpire. I'm guessing these attacks happened on the other side of town while I thought all was well? By the time I get these letters I've put in another hour or two of play so I can't really be expected to reload...
I know there were random dragon attacks in some cities and in about 150 hours of the vanilla game I did lose a few NPCs to those but never invisibly. The dragon deaths were preventable, these simply aren't, and that's the distinction that matters. Windhelm in particular is noticeably ghost town-y after just 10 hours of Dawnguard.
I'm assuming the smart folks at Bethesda will recognize this is gamebreaking and address it in the very next patch, but in the meantime does anyone have a creative workaround I haven't thought of? Otherwise I may just have to stop playing until the patch, which svcks, because I have been enjoying this DLC.