Issue symptoms
The data filter widgets aren't applying to the reports on my dashboard.
Resolution steps
For the data filter widget to work, the attribute you are filtering by needs to be from the same dataset as the report. A filter from one dataset cannot be applied to a report built on a different dataset.
However, if you are working with the dashboard builder (Beta), you can link filters across datasets. All reports from the linked datasets in the dashboard are filtered when the viewer applies a dashboard-level filter.