It happens to me on both AF and JOON. I’ve just checked the seat map again for my flight tomorrow to Birmingham from CDG and I have now been given a middle exit row seat and the rest of the seat map is blocked out. There is no possible way that this flight is full, it never is and even though we are in the run-up to Christmas, I very much doubt tomorrow’s will be. Therefore I can only assume that there is a fault with the AF system regarding seat access for STE+ members or they’ve changed the rules. Not good.