So I have done multiple test orders, all of which worked fine through my macs and iPad, on different browsers. I just launched my store and had a customer tell me that after submitting the order in PayPal they get returned to checkout step 2 rather than checkout success page? I'm using paypal express checkout because I read it is more reliable even though I have the express buttons turned off. Any idea why this would happen? They were using a PC with Firefox? Maybe I have a bad setting? I'd hate to be losing orders and not even know about it. Any help would be great!