Hello,
We have CRM 2011 on Prem.....this just started happening...when you go into a COntact Record, and click on the Related Activities, the ribbon button "Add New Activity" is disabled.
It used to work.
We are able to use the ADD ribbon and create activites...so it is not a permissions.
I have made no changes to the ribbon itself in over a year.
Any help would be appreciated.