Change the persistent form server behavior to use the button press trigger instead of "always".... with always, it resets when you return to the page and makes it blank.
Attach a copy of the WA_Email.php page and I can take a look at it to see why it might have an error.
The error when you hit next sounds like it might be a trigger issue for a file upload on the second page. Make sure that is set to file upload based on the form button so it doesn't try to run right when the page loads as well.
Did this help? Tips are appreciated...
