Thanks Alex for your reply. I’ve made a new installation of wordpress using the pinboard layout. The first thing I’ve done was change the layout to the option “no sidebars” and my site continue as “full width”. Is there any trick to change the layout?
As you can see my website continues full widht: http://dulce-eau.rhcloud.com/
But I can make single pages use ‘no sidebars’: http://dulce-eau.rhcloud.com/pagina-exemplo/
Thank you in advance!