TOPIC: Confirmation Page shows page within a page

Latest and greatest 2_7_0g_j15

After the initial registration form is filled out and the user hits submit the confirmation page is shown for a few seconds correctly...but the page is still loading. When it finally renders the Event Listing page displays within the confirmation page...complete with duplicate page banner and footer for the site. The confirmation text and next button are pushed down to the bottom and the user no longer can see them without scrolling to the bottom.

Ideas?