[ic] receipt.html not getting displayed

[Interchange user]

When I place an order from the checkout page, it is successful, but 
etc/receipt.html is not displayed.

Looking through the archives, someone who had experienced the same problem 
said that they had put this right by editing catalog.cfg so that the 'main' 
Route was the last. I tried that, moving the 'default' and payment Route 
entries, to no avail.

I also tried moving just the payment stuff, and leaving the 'default' route 
last, because there is a comment in there that says 'default' should be last.

I tried commenting out the 'RouteDatabase   route' line, too.

Using code based on 'Foundation', and running IC 4.8.2.

Anyone know what's up?