Both setups are set to "public viewing"

Now on the contact's slide we can both see all the emails exchanged.

BUT:

I am using the 2016 brand new version of Zoho CRM and my colleague is still using the old version .. he can click on all emails and view/read them. On the other hand I can see all the email exchanged but if I click on of of my colleagues emails it loads for a second and then nothing shows up... is this a bug in the new version or am I missing something?

Thank you