This morning I had about 3/4 of my (PoF) experience bar full and when I signed in after the patch it was reset to zero. Is there a reason for this?
The new episode brought a new mastery that I think starts being worked on automatically. So if you'd finished all other desert masteries before and was getting normal exp the game post-episode arrival would be like "No, no normal exp right now, mastery takes priority."
You started training the new mastery