I have the PP Add-On and my form worked well in Firefox an hour ago. Now it doesn't work at all. The "submit" button should go to PayPal (conditionally) but only goes to the "Thank you for your order" page I have in Wordpress. On the back end, these test orders are creating entries, and have PayPal as their payment method.
I'm using PP sandbox & the plug-in's testing mode. I have the latest version of WP. I was just about to send the link out to get others to test it.
Please help!