Ok, so this is the second time in a row this has happened to me on the same character...
I Enter "Roots of Terror" instance. I take a path, kill the chak, talk to the magister, but then when it comes to "Talk to Braham" he just starts following me around like a party follower and after a moment then just stands there and won't interact with me at all. I cannot complete this quest.
Edit: I have reported this via the in game bug report also.
Edit, Edit: After 10 minutes of doing nothing. Not interacting, not talking, just, nothing. he finally started to comment on the chak filled pit and progressed the story. But to have to wait 10 minutes for an npc to prob their dialogue is still ridiculous.