Zoho Sheet View: export to xls not working?

Zoho Sheet View: export to xls not working?

Hi, when you request a Sheet View from a list of contacts, then normally you can export that list into csv, excel, pdf, ... 
But this doesn't seem to be working today? When I request an export, nothing happens... 
And I need this urgently to export the contacts to my mailing program.
Can anyone help?