How can $GLOBALS[$this->selected_module] get unset during payment processing?

[technoczech]

So I'm using the Paypal Website Payments Pro contrib by dynamoeffects. I have it all set up and working, except when using express checkout it's not displaying the Payment Method section on checkout_confirmation.php, which throws off the formatting of the whole screen. Weirdly, if I refresh checkout_confirmation.php, then it will show up and the page looks normal.

 

I *think* I've pinned down the problem to $GLOBALS[$this->selected_module] somehow getting unset somewhere. A var_dump before the refresh shows it null, and a var_dump after the refresh shows the correct module.

 

This line in checkout_confirmation.php is false before the refresh (and consequently prevents this section from displaying):

if ($confirmation = $payment_modules->confirmation())

 

The confirmation function in payment.php recognizes the array, but not the selected module:

function confirmation() {

var_dump('this modules = ' . $this->modules); <<<returns "Array"

if (is_array($this->modules)) {

var_dump('selected mod = ' . $GLOBALS[$this->selected_module]); <<< see below for error returned

if (is_object($GLOBALS[$this->selected_module]) && ($GLOBALS[$this->selected_module]->enabled) ) {

return $GLOBALS[$this->selected_module]->confirmation();

 

The var_dump on $GLOBALS[$this->selected_module] returns:

Catchable fatal error: Object of class paypal_wpp could not be converted to string

 

When I do a var_dump of $payment_modules->confirmation on the checkout_confirmation page, it says null before the refresh, and gives the correct selected module after the refresh.

 

That's just a snippet of everything I've looked at; I'm happy to post more if needed. Am I missing setting a global variable somewhere? Any ideas, anyone, please...? My head's really sore from banging it against the wall...

 

Many thanks in advance!