Quirk in Activity Log Pagination

I went into my activity log today and clicked the link for the previous week. If I click on any of the page links (2, 3, 4, 5, next 30), or sort by any of the column headings, the display jumps right back to the default view. I looked at the pagination links and it appears as if the date parameter isn't being passed: /usradm-browse-action?list=log&orderBy=ts&sort=desc&type=&user=&range=week&offset=30. If I paste the URL in a new tab and append &date=2009-01-26 then it works fine.