I'm running Magento 2.1.13 (don't tell me to upgrade, that's not an option at this time)
I've created a new user and given them a user role of "Sales", and have limited the access control to the Dashboard, Sales, and Customer tree.
But when I try to access the admin with that user, the menu looks correct, but none of the items work. Nor does the user dropdown (to sign-out) or to change store view.
If I give the user all permissions, everything works fine.
Does anyone have any ideas what could be the issue? Possibly not selecting a specific option on the tree?