If the problem persists after trying this, it may be related to a known issue. The engineers are aware and are working hard to get this resolved as quickly as possible. I recommend calling in to speak with a member of the Support Team. An agent will be able to add you to the list of affected accounts. Once you've been, you'll then receive email notifications regarding the fix. The number to speak with an agent is 1-800-488-7330. The most up-to-date contact information can be found here: https://help.quickbooks.intuit.com/en_US/contact.
With this information you'll be back up and running soon. Please don't hesitate to contact me if you have any other questions.