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Is the bank account in exactly the same name as your paypal account name?
Have you tried another browser / cleared your history/cache?
Is it a NZ bank account?
Has it been linked to any paypal accounts in the past?
Name on the bank account has to match the name on your paypal account so that would be the issue.
Also you may not be able to change the nickname as normally paypal will only change a name for legal reasons ie marriage OR for a 2 character minor correction.
Any documents you send in has to show the name on your paypal account was your legal name but that has now changed to another legal name.