I've been using the Paypal Pro plugin successfully for several months, but today my customers are getting the following message when they attempt to renew, or purchase new subscriptions: Fatal error: Call to a member function on a non-object in /home/tspmax3/public_html/amember/plugins/payment/paypal_pro/lib/PayPal/CallerServices.php on line 163 I've changed nothing on the site .. no updates, no upgrades, no server switches or configuration changes ... Paypal is not acting like they've changed anything on their end, but I'm skeptical. Any thoughts?