If the invoice page isn’t loading, it could be due to browser-related compatibility issues or an outdated session, Gavin. To resolve this, log out of your QuickBooks account and log back in to refresh your session.
 

Alternatively, switch to a different supported browser such as Google Chrome, Microsoft Edge, or Safari, as some browsers may not support certain features, which can prevent pages from loading properly.
 

Please let us know if you need more help.