Zoho Mail - does not function

Zoho Mail - does not function

I can log into Zoho fine, and I do have (and always have had) a Mail tab.  It has a green dot.  But there are none of my previous emails shown.  No new emails I have sent since noticing this problem show either.  No buttons at the email screen will do anything.  I have the same problem with Firefox and with IE8.  This has been going on for several days.

Can someone assist me to get my email back please?

Al Taylor.

ps.  It is ironic that I can tick a box - "Notify me when a response is made."  How will I know?