I have Atahualpa 3.4.6 with Wordpress 3.0.4. I want a gallery on a page with no sidebars, but with the top of the page present. If i follow your FAQ with nosidebar, i get a complete blank page.. where i cannot display my gallery at all (shashin gallery)
EDIT: I had not seen the options in the theme about "Style and configure SIDEBARS" where i could actually remove the sidebars from specific pages.. voila!