Let's reset the app data to resolve the issue. Here's how:
Click File and select Refresh.
Once done, go to Help and choose Reset AppData.
Then, log back in to check if that works. In case you're still getting the same result, please call us so we can double-check why it's not loading up. Our contact details can be found in the Connect with a QuickBooks Expert section of this article: Get Help With QuickBooks Online.
Visit us again in the Community if you have other questions.