I am unable to add new credit card to pay subscription which has been suspended All I get is a blank grey screen.

Hi iain-mckechniema, thanks for joining the Community

Please confirm that the address for the credit card matches the address in your QuickBooks settings. The addresses must match to authorise the payment. You can check the address by logging into your Intuit account > navigate to the Profile tab > Address. 

If you're still unable to re-subscribe following this, please call our team on 0808 234 5337 or begin a chat so we can check some additional information.