from the SfTS website:
Here are some standard reasons why the reports do not appear to work:
- Warehouse Syncronisation
The Scrum for Team System reports are generated by SQL Reporting server which uses the TFS warehouse database as it’s data source. By default, the warehouse database is only updated with the work item tracking data every hour. This means that it will take at least an hour before changes made to work items are reflected in the reports.
- Overnight Update
Some reports plot lines using the delta between days, so no data will be visible until the following day.
- No Sprint Data
Sprints must have a start and end date before they can be viewed in reports.