It's a new, known problem that they're working on.
Thanks for letting us know about this.
Lexiesmemere is right. You can refer to this link as well: https://quickbooks.intuit.com/community/Other-questions/I-can-t-get-any-reports-to-generate/m-p/2406...
I will let you know once we have an update. For now, you can try to do browser troubleshooting to check the reports from time to time.
Let me know if you need further assistance. I'm always happy to help!