On a new install, when submitting a ticket as a guest, the open.php page reloads as blank - with no ticket created.Clearly I've missed something on config.
We'd need more info about your install to help.
Please help us to help you by reading and following the posting guidelines located in this thread: Please read before requesting assistance. The more information you give us the better we will be able to assist you. Thank you.Additionally a blank page usually indicates a PHP error. Please consult your error logs and provide the error.