Thank you!

This problem rears its ugly head in many different ways. It occurs when I attempt to open an SSRS report on my local workstation that connects through Windows auth. to a production instance and surveys user-database permissions. To resolve I need to create a special SQL login with sysadmin permissions on the instance! The alternative would be to map that login to EVERY single user database with db_datareader permissions, something hard to pull off logistically (and messy).

So at the moment I'm stuck with a less than ideal scenario, and I want to try the Kerberos-auth option...