Since Friday I am not able to access the Zoho Mail from the Web client. While I am accessing the  https://mail.zoho.com/zm/  I see the "Loading... myemail@company.com" message and a "progress-bar" like widget from the Zoho icons rotates forever. 

Tried on different browsers (IE, Firefox, Chrome) from different OSes without success. Mobile app works OK with the same credentials. Here is what Web Debugger says: