With DevTest 9.1, if you try and filter a report based on a date range, the range is ignored in the result.
This was a defect in the portal's war file. This has been corrected in the current release of DevTest 10.1
DevTest 9.5.1, all versions (Windows, Linux, macOS)
We have a patch that may address this issue for you. Please open a support ticket and if your issue matches this issue, we will supply you the patch.