Started a new character a week ago and I have made it to the trinity restored. I make it to where Karliah takes me to into the twilight sepulcher. She leads me into the sanctuary partially and randomly stops. At this point anything i try doesnt work, save for attacking karliah and sheathing my weapon which activates the step to activate armor stone. From here nothing happens again. I have to leave the sepulcher and return to get karliah to talk to me and enter the ceremony chamber, Once she we all stand on our respective circles I can no longer move and karliah stands there with her arms raised with nothing happening. I wanna finish this questline, but the bugs are preventing me in every way. Anyone have tips?

I should also note that when you first meet with the brynjolf and karliah there is no conversation that starts and both npc's are not able to be spoken too. When i leave the ragged flaggon though the quest moves to the next step.

If you are on conlsole, have you tried clearing the cache?? Or just shutting off the console and then restarting it.