I'm trying to set up sample mp3s for my audio products. I've followed the directions above, in the tutorial, and in the manual. When I click on "Assign to products" I get dumped to the Admin front page, and the product does not have the samples attached. This is a new installation of v1.3.9h running on Linux 2.6.18-274.3.1.el5, PHP 5.2.14, and Apache. I would appreciate any help.