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At the end of an order I get to (say) checkout/13/complete. Whether authorised or admin, and independent of payment method, the page only shows the title "Checkout complete" and no other message. Notification emails are sent ok. The Completion message checkout pane looks suspicious: I figure I should see some configuration options but none appear (refer screenshot).
I *should* be seeing the default completion message (your order is #, etc.) Any idea why this isn't appearing?