Why is the PayPal Checkout page greyed out?

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It seems this fault has been going for years, PayPal don't know why it is and say it's our fault.
I think the checkout page is hosted somewhere else?
My regular customers don't have this problem, it's the NEW customers that can't pay. I suspect PayPal save their details so checkout is faster or pre-filled?
Does anyone have this problem?
Did anyone solve it? Ta everyone, Steve

Compare a table definition to function

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Hello. I am trying to check if a table definition (the default value on a constraint) is equal to UTC Time by using the following query:

IF NOT EXISTS((SELECT object_definition(default_object_id) AS definition
FROM sys.columns
WHERE name = 'ModifiedDate'
AND object_id = object_id('dbo.WorkflowAudit')) == GETUTCDATE())

However, you can not compare a function (GETUTCDATE()) to this Select Statement. I need to do it this way because I am building an update script and it can only update the table IF the table definition is NOT equal to UTC TIME Any ideas? Thank you