signing out of spreadsheet

signing out of spreadsheet

Hi 
Can you tell me why this message keeps appearing when I try to use the sign out at the top right corner with the spreadsheet open.

The page you requested was not found


Sorry about that! The page you were looking for may have been moved or the address misspelled.

  • 1. It is possible that you typed the address incorrectly.
  • 2. The page or file you are looking for has been moved or does not exist
Surely the sign out is a link within  zoho spreadsheets, so it has to be something that is wrong at your end.
Please can you reassure me that when I and those that I have shared spreadsheet with go to zoho home page or close browser have been sign out of zoho spreadsheet

Thanks 
Elaine Robertson