Custom fields no longer appearing

Posted this elsewhere, but not sure what happened to it.
the custom fields have disappeared from my test install, including the ones that Classified ships with:

http://historicracer.co.uk/wordpress_test/classified/porsche-991-targa-pretend-edition/

Additionally, my Classifies results page no longer makes sense:

http://historicracer.co.uk/wordpress_test/classifieds/

Everything still there in the backend. Not sure what I've touched. Could simply start over, it's just a test after all, but I'd rather know what I did in case it happens again!

Any thoughts?

Thanks, Neill W