I can't seem to use the print_successful_redirect function to refresh to another page when using plugin pages, as we see in the save confirmation pages:
The problem is with the "/mantis/" appearing in the URL leading to a 404.
I've had the same result with using html_page_top with the redirection URL.
XAMPP, PHP 5.3
MS Windows 7 64-bit
Mantis 1.2 Final