Selecting a time range either through the time picker or visually in a graph does not always update the dashboard with the new time. Sometimes it will work the first time, but then won't work anymore. The workaround is to enable auto-refresh. On the auto-refresh interval it will update the dashboard with the new time.
Similar problem with filters. Sometimes they will work and appear at the top, under the filter bar. Other times they will work, but not appear. Other times they will not work. Again, enabling auto-refresh will cause the dashboard to update with the selected filter. However, the filters still will not appear under the filter bar. And that being the case, there is no way to disable the filters.