I am playing Legacy of the Void and and have lost my campaign progress after completing this last mission (4th mission I think). After the mission ended, I was taken back to the Legacy of the Void campaign screen where it indicates I need to start a new campaign. I saved the last mission several times (I was trying to get all the achievements and need to restart from one spot a few times) and if I go back to the saved game and replay/finish the last part of the mission, the campaign still won’t progress.
EDIT
Disregard… I just realized there’s a prologue for this campaign, which I just finished, and is why it says I need to start a new campaign. Wow… sorry about that. 