No, it's not checked, because with CompleteRSS activated that's impossible. If you read the "known issues" section in
http://neosmart.net/blog/2006/completerss-content-complete-feeds-fully-valid-and-raring-to-go/, you will see this warning:
In the WordPress Admin Dashboard, under Options | Reading, the selected feed setting is ‘Summary’ and cannot be changed. This is intentional, and is required for CompleteRSS to work.
I've searched for another plugin which could give me the same functions as CompleteRSS, and I've found it in Full Text Feed,
http://cavemonkey50.com/code/full-feed/. I've installed this plugin, deactivated CompleteRSS, and everything works fine: WP-Print, complete feeds and the rest. I haven't deleted CompleteRSS plugin, in case you want me to check something else.
Anyway, Gamerz, thanks a lot for your patience and dedication. It has been a privilege to have such a great help. All the readers of my blog,
La Bitácora del Tigre, know how deep and sincere is your compromise with your plugins users. You can read it (in spanish) in:
http://www.labitacoradeltigre.com/2007/06/12/copia-de-seguridad-de-la-base-de-datos-y-otros-plugins/and
http://www.labitacoradeltigre.com/2007/06/21/actualizacion-de-wordpress-a-la-version-221/