When I click on the "reports" tab I see a list of reports but the "Create" tab (onthe upper right corner) that was on the dashboard word is no longer displayed.
Are you an admin user or a regular user?
If you are regular user and some Role assigned to your profile has no access to edit Reports then you will not be able to create.
Additionally you can double check if there is any customization which eventually had drop of the create option.
Possible customizations places:
Retrieving data ...