i am having the same issue, i have never reversed a charge or requested a refund.
i searched through this section to see if anyone else was haven a prob yesterday but no luck, i thought it was a problem with paypal or the store...again
so far ive managed to buy items in the past butlast 2 weeks ive tried to buy anything and no success
seems like every time i get paid i try and buy something and theirs always a problem =\