Sorry if this has been posted but I couldn't find it with the search function. Upon entering the castle for the first time with Serana Vingarmo isn't in the entry hall to talk to Serana so I can't proceed with the quest. I have tried reloading and uninstalling then installing Dawnguard again but nothing appears to work if anyone might know a solution it would be quite welcomed lol.
Edit- Found a semi-work around by running in and punching Vingarmo in the face then fleeing and returning a few days later. It fixes the issue but is midly inconvenient.