So I downloaded Dawnguard, and I'm at the part where you accept the offer to become a vampire. However, when asked to transform into a ampire lord for the first time, I am unable to. I've activated the power, but nothing happens. I've waited multiple days to see if the power resets, but it doesn't work. I can't transform, and he just keeps asking me to. Is it a glitch related to my formerly being a werewolf? What do I do?

I answered the other one.