Hello there, Stuart. It seems you've posted a similar question twice.

My colleague has already addressed your inquiry regarding your invoices. They recommended some troubleshooting steps and, if necessary, contacting our support team. Please refer to this link: https://quickbooks.intuit.com/learn-support/en-uk/account-management/i-cannot-preview-invoices-or-pr...

If you have other questions about QuickBooks, please post them here in the Community. We're here to help you in any way we can, Stuart.