PAYPAL PRO FAILURE - ‘this transaction cannot be processed’

My site is upgraded to OC Version 2.0.2.0. All is working apart from PayPal Pro.

Since the upgrade there has been some issues with payments via PayPal Pro, in that the browser says ‘this transaction cannot be processed’.

I have tried deleting and creating a new API key, but it makes no difference.

Looking at the OC Extensions folder in the Admin section reminds me that we opted for the PayPal Pro version rather than PayPal Payments Pro (UK) - I was advised to use that one. Its a UK business taking international orders, is this the best option???

In trying to resolve this, I tried to look at the settings for the PayPal Payments Pro (UK) version, but when I click on install, and go to Edit, I get an error with a page of references starting

“Notice: Indirect modification of overloaded property ControllerPaymentPPProUK::$data has no effect in…”

As you can imagine, this is not good. Can you please offer any advice/assistance on resolving this issue? I know PayPal made some changes in recent months, and perhaps we need an SSL Cert, but I thought that this would still work.