Cannot open email configuration tab

Cannot open email configuration tab

In Zoho Mail on the email page I am being asked to check/reset the email settings. When I click on the email settings tab nothing happens - I tried several times.. All other configuration tabs work just fine. How do I resolve this problem?

UPDATE: After being down for 27 hours the email tab is at last working again and I was able to reset my account. Any ideas on why this happened?