Forum search sort functionality

When I try to search the forum, I would like to be able to sort the results by date in descending order. I have tried making this setting either in the advanced search window, or via the options at the bottom of the results page. In neither case has the sort worked. It seems to always be sorted by Author in ascending order. I have tried this in Firefox, Google Chrome, and even (gasp) Internet Explorer. It doesn't work in any of those browsers.

We use phpBB for the forum. This will be changed soon. phpBB is terrible in just about every way. We've finally been able to dedicate some of our internal resources to replacing it with something fast, secure, and reliable. It will be coming shortly after the new year.