Board Thread:Skyrim/@comment-108.95.121.195-20150413150754/@comment-6881629-20150414120313

Not very good advice i'm afraid but as its almost been a day with no answer i'll go ahead. It shouldn't be SKSE but could be one of the other mods so check their pages on whichever site you got them from, if your not sure about load order you can use LOOT to sort them and it can point out conflicting mods too.

There is a fix for Harkon not biteing here on the Bloodlines bugs list but it doesn't entirely make sense i think this on the Steam forum is the same fix but a bit clearer, there are commands but those may not work and wouldn't really fix the problem anyway just put it off until later.