Exciter Writer

Whenever I try to buy at Marketplace, instead of being redirected to the cashier page, I get a blank page. This has been happening ever since the Marketplace maintenance started, so I figured that had to be the reason. But now the Marketplace maintenance is listed as completed, but I'm still having this issue. This issue applies to any item in Marketplace, and I've tried with browsers Firefox, Chrome and Internet Explorer. Thanks for help.