when do you unflip your progress cards in etherfields. The rules are not clear in this.
You get to unflip if there's something that tells you to unflip your cards. For example, the Specialist's unique action. Additionally, you may discover some map location effects, slumber map actions, and some cards that allow you to do so.
Another way to remove flipped cards is when you have 4 Progress cards in your Progress zone, and you place a new one. You're allowed to discard one of those four, including the flipped one, to place the new one (see rules pg. 13).
You also remove cards from your Progress zone when performing an Awakening.