You can't use this notation

$plugin->interpretacion_fecha

to get user settings, that will fetch plugin settings (global, site wide setting for the plugin).

To get a user plugin setting you should use

elgg_get_plugin_user_setting();

http://reference.elgg.org/engine_2lib_2plugins_8php.html#a170cd3240d9b5193ac8f38d908d8a64c

Thanks Matt, it works

i'm using

$plugin->getUserSetting("interpretacion_fecha", elgg_get_page_owner_guid()

that works too :)

1. Override sidebar.php in plugins (e.g. mod\blog\views\default\blog\sidebar.php | mod\bookmarks\views\default\bookmarks\sidebar.php | mod\file\views\default\file\sidebar.php | mod\pages\views\default\pages\sidebar.php etc) with removing:

echo elgg_view('page/elements/comments_block', array(
        'subtypes' => 'blog',
        'container_guid' => elgg_get_page_owner_guid(),
  ));

2. Or create your own empty views\default\page\elements\comments_block.php

thanks, it works!