New version does not recognize iTunes subscription for Premium content

I really enjoy reading le Figaro and I have subscribed to the Premium content for over a year; however, each time the app is updated, there is always a problem recognizing my subscription. I cannot access the premium content as the message says subscription expired. The app developer has been of no assistance whatsoever, despite my requests (in French) for assistance. Please resolve this issue as soon as possible.

john1591 about Le Figaro : Actualités et Info, v5.0.1