Merchant Security Updates: Learn how security upgrades may affect your integration at the 2016-2017 Merchant Security Roadmap Microsite
Payments Standard Updates: Beginning March 29th 2017, PayPal will offer a few enhancements that may require integration changes. Read more here: Payments Standard Upgrade FAQ
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This is a known issue at the moment unfortuantely.
Our developers are actively investigating the cause and how to resolve.
Once it's resolved, I'll let you know by reply within their thread.
Apologies for any inconvenience