Hi Jason,
I think we must be reading from different hymn sheets! I'm using the pdf file:
ecart_populate_checkout_fields.pdf
which was linked-to from the bottom of the guide at:
registration_on_checkout.php.
and which, for step 9, makes no mention of the possibility of the session variable being named differently - hence my suggested changes. Perhaps I'm using an out-dated guide; which one are you quoting from ?
cheers
rob