What potential issue is the user facing when trying to submit a form after logging in?

The potential issue the user is facing when trying to submit a form after logging in could be related to session management. If the session is not properly initialized or maintained after logging in, the form submission may not work as expected. To solve this issue, make sure to start the session on every page where session variables are used, including the form submission page.

<?php
// Start the session
session_start();

// Your form submission code here
?>