Hi JC and Paul,
Is the only problem you have with customize.php or do you have problems when viewing the site in the front end?
What changes have you made to your theme to support Layouts?
I need to request temporary access (wp-admin and FTP) to a test site where the problem has been replicated in order to be of better help. You will find the needed fields for this below the comment area when you log in to leave your next reply.
Best regards,
Bruce