So, I put the ingrediants in the recipticle, and Serana notes it is her turn... and does nothing. I ask her to do it and nothing happens. She just stands there.

Earlier on the Moth Priest held the scroll with his arms at his side, and the quest didn't update his I used FusRODAH on him. This isn't fixing it for Serana. I simply can't advance.

I have no mods running whatsoever.

Solved via the console and setstage, for now. Hope its fixed in a patch as it is a rather nasty bug.