@balihr, nothing seems too amiss, although that jQuery version is quite old (almost as old as the PHP version!) and should really be updated to at least 3.4.0 if not 3.4.1. I can't explain the 'non-generation of OPC logs' during the paypaldp (PayPal Payments Pro) processing (the "Customer List" setting was the only possibility that I could come up with).

Can you reproduce the situation "on demand" or is this a case where "it happens when it happens"? Perhaps turning on the paypaldp's full logging might help, but I'm running out of ideas.