In Borderlands 2, there is a quest early in the game given by Dr. Zed in Sanctuary called "Do No Harm".
I am on the part of the quest where I am supposed to bring an eridium shard to Dr. Tannis. When I speak with her, the objective is marked as complete, but the quest does not continue, and seems to be stuck. Talking to Tannis or Zed causes them both to say something like "do you have any progress updates?".
Is this a bug, or is there some objective that I am missing? Is there a way to un-stick it?