Un bouton ne s'affiche pas avec pls navigateurs

Bonjour,

J'ai un souci urgent, un bouton pour poster une annonce ne s'affiche pas avec plusieurs navigateurs ou OS.
Tout petit site sans prétention mais bon ... je viens de découvrir ce problème.
Base wordpress, thème Classipress
Adresse sur demande.
option débug :

Array ([page] => 0 [pagename] => create-list [error] => [m] => [p] => 0 [post_parent] => [subpost] => [subpost_id] => [attachment] => [attachment_id] => 0 [name] => create-list [static] => [page_id] => 0 [second] => [minute] => [hour] => [day] => 0 [monthnum ] => 0 [year] => 0 [w] => 0 [category_name] => [tag] => [cat] => [tag_id] => [author] => [author_name] => [feed] = > [tb] => [paged] => 0 [comments_popup] => [meta_key] => [meta_value] => [preview] => [s] => [award] => [fields] => [menu_order] => [category__in] => Array () [category__not_in] => Array () [category__and] => Array () [post__in] => Array () [post__not_in] => Array () [tag__in] => Array () [tag__not_in] => Array () [tag__and] => Array () [tag_slug__in] => Array () [tag_slug__and] => Array () [post_parent__in] => Array () [post_parent__not_in] => Array () [author__in ] => Array () [author__not_in] => Array () [ignore_sticky_posts] => [suppress_filters] => [cache_results] => 1 [update_post_term_cache] => 1 [update_post_meta_cache] => 1 [post_type] => [posts_per_page] => 7 [nopaging] => [comments_per_page] => 50 [no_found_rows] => [order] => DESC [cp_options] => scbOptions Object ([key: protected] => cp_options [defaults: protected] => Array ( [home_layout] => directory [stylesheet] => red.css [allow_registration_password] => 0 [favicon_url] => [feedburner_url] => [twitter_username] => [facebook_id] => [google_analytics] => [gmaps_region] => US [gmaps_lang] => in [distance_unit] => E [search_ex_pages] => 1 [search_ex_blog] => 1 [refine_price_slider] => 1 [search_field_width] => [search_depth] => 0 [cat_hierarchy] => 1 [cat_count ] => 0 [cat_hide_empty] => 0 [cat_menu_count] => 0 [cat_menu_hide_empty] => 0 [cat_menu_depth] => 3 [cat_menu_sub_num] => 3 [cat_dir_count] => 0 [cat_dir_hide_empty] => 0 [cat_dir_depth] = > 3 [cat_dir_sub_num] => 3 [cat_dir_cols] => 2 [ads_welcome_msg] =>

Merci