When you go into the tomb to cure kodlak's soul of lycanthropy, DO NOT BRING SERANA! She attacks kodlak and now he is stuck there and not talking. I think he is frozen. I initated the quest to find serana's mother but decided to finish the companions questline (I think this might be where the problem is) ... so now she wont stop following me. I dont know how to fix the problem. I've told her to wait.. and she outright refused.. I told her to leave, same story... Everytime I get near Kodlak, she attacks him. I managed to put her behind a gate but it didnt work either. He just wont talk to me. Tried reloading. nothing.

I have really bad ADD. I start a quest but end of finishing an entirely different quest lol.

How about you do Serana's quest first and get to a point in the Dawnguard questline when you can dismiss her (might not be until the end), then go back and cure Kodlak? Other than that, I'm not sure. Best of luck resolving this!

I solved it and yeah you were right lol. Now trying to figure out the totems.

Has anyone else not been able to make the Companions leave Ysgramor's Tomb after installing Dawnguard and finishing Glory of the Dead? I know this isn't related to the specific problem of the OP, but I thought I'd mention it. I've noticed this problem only crop up in xbox 360 users since the release of Dawnguard, so I'm guessing the two things are related and it's people who have installed Dawnguard who are having the problem. I find it bothersome as I wanted to make a werewolf character (using the new skill tree) and now can't get any of the totems because of none of the Circle leaving the Tomb. I've tried waiting for a long time too (obviously) but to no avail. I made a thread about this in the regular Skyrim Xbox 360 Hardware and Software Support subsection, but it got buried already and as I said I'm almost certain it's Dawnguard related (maybe due to Aela now presenting the option to turn you back into a werewolf after becoming a vampire lord - I couldn't say).