So i've already played through all of dawnguard on the vampires side and made a new char for the dawnguard side. Went through the tomb to get Serana and after i break her out of the ground it says to speak to her. Problem is I CANT. It wont let me speak to her and she says nothing to me so i just have to stand there and cry. Ive tried reloading saves but nothing is working. Anyone enconter this or can help?

Hmm, kinda new to me. Never encountered this, though weather this will help.
I once had to talk to an NPC but it wouldent let me since NPC was stuck in combat, all i did was attack the npc till they went to ground since it was an essential NPC which i'm sure serana is. Could give it a try might let you talk to her afterward if you try that? :S cant guarantee it'll work though.

Yeah i had already tried that out of frustration, didnt work I looked it up on google and there are people on yahoo answers complaining about it but no solutions.

Have you tried sprinting into her and knocking her off balanace...that sometimes works .

FusRaD'oh her? see if that works. It does when some NPC is stuck stairs or rocks.

None of them worked