Pay Now button is dead

Hi,

The Pay Now button on my invoices has suddenly stopped working UNLESS the user is logged in.

I’ve checked the settings and the option “Show invoices only for logged in recipients” is unchecked. Also, I have toggle Compatibility Mode on and off…makes no difference.

Payment gateways are configured (as I say, if I’m logged in, everything is good).

Here’s an example: https://redsquirreldesigns.com/invoice/?invoice_id=dc3148b88bc268fca499c71d7d3d2627

This is now URGENT!!!!