If I select Grid Cells in the Reviewer Window using the Select Grid Cells Button, then Select the Zoom to Selected, my Hash pattern envelops the Selection which is what I would expect, if I however, adjust the Map View by using the Continuous Zoom Pan Button (Any button on the Standard Toolbar should suffice) by just a very small increment, the Hash Pattern Grows beyond the Selection inside of the Reviewer Overview Window. This is not What I would expect. The Hash pattern now reflects the view in the Map, not the Selection in the Overview Window. Is this the expected behavior?
Occasionally, you can see the same behavior with the Hash Symbol when Zooming to Active Grid Extent from the Right Context Menu. This example is harder to repro.