Cannot create a New Event Tomorrow Onwards

Cannot create a New Event Tomorrow Onwards

For some reason when a Standard User is logged into the Zoho Mail platform and tries to create a New Event tomorrow or onwards within an Account or Contact in the CRM App, it will not let you do so.  But if you log into Zoho CRM and go to Account or Contact and create a New Event tomorrow or onwards it allows him to do so.  

Any ideas as to why this might happen?  I have Administrator access in Zoho and when I am logged into the Zoho Mail platform and use the CRM app through my Zoho mail, I can create a New Event tomorrow onwards.

It seems odd it has to do with the access level, but that is the only thing I can think of as to why it might be happening?

Any ideas greatly appreciated.

:)