TFS : The permissions granted to user are insufficient for performing this operation. (rsAccessDenied)

I got the error message :
The permissions granted to user are insufficient for performing this operation. (rsAccessDenied) on a user today when running the reports from Team Foundation Server.

This was an existing user who had not experienced this particular error before. I had just created a new project, and had assigned the AD user group (using the excellent Pwoer Tool - Team Foundation Server Administration Tool) as a contributor/publisher. I even created them as a standalone user and still no joy.

After some web crawling I found that there is an interesting anomoly in Reporting Services. The role "Publisher" by default does not have the ability to view reports. OK....

To resolve the issue :

1. Open SSMS and connect to the Reporting Services instance.
2. Plus open security..roles
3. Open the Properties window for the Publisher role and check :
View Reports
View Resources
View Folders
View Models
4. Click OK.

For more information see :
Lesson 1: Setting System-level Permissions on a Report Server
and
Lesson 2: Setting Item-level Permissions on a Report Server