Did you also notice problems when paying MC Prepaid in FR, within the last couple of weeks?
It mostly rejects the transaction stating 'the card type is incorrect' - even it was working all year long. I checked 3 different cards (MB, N+ and polish BZ WBK - all the same).
It worked once last week, now again the problem. Also my friends reported the same.
It seems for me like they are trying to ban some cards to make people paying 5€ fees :/