Cannot connect after clicking request button in Firefox 3.06 on PC

scenario:
1) I invite friends, and
2) they click on the request button in facebook (see attach drupal_request_button.png),
3) facebook sends them to the site's homepage (we'll improve that later),
4) they then click on the "connect" button,
5) the pop-up that shows up doesn't allow them to them connect (see attach drupal_div_size_2009-02-24_1933.png).