Last night I updated my iPad to the latest OS and used greenPois0n to JB. Everything seemed to go fine except I've noticed i can't install any apps that require a purchase. When I tap on the Purchase button nothing happens. If I try tapping on the button in the description showing the purchase price the screen change, like I'm going to be taken to the purchase page, but it just goes black. I've tried googling but I can't find anyone having this problem.