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using wp_enqueue_script() or wp_register_script() before init is wrong.
This may be causing the issue:
function gplus_comments_init()
{
define( 'GPLUS_COMMENTS_VERSION', '1.3.0' );
defined('GPLUS_COMMENTS_DEBUG') or define('GPLUS_COMMENTS_DEBUG', false);
defined('GPLUS_COMMENTS_DIR') or define('GPLUS_COMMENTS_DIR', dirname(__FILE__));
defined('GPLUS_COMMENTS_URL') or define('GPLUS_COMMENTS_URL', rtrim(plugin_dir_url(__FILE__),"/"));
defined('GPLUS_COMMENTS_LIB') or define('GPLUS_COMMENTS_LIB', GPLUS_COMMENTS_DIR . "/lib");
defined('GPLUS_COMMENTS_TEMPLATES') or define('GPLUS_COMMENTS_TEMPLATES', GPLUS_COMMENTS_DIR . "/templates");
wp_register_style('gplus_comments_font', GPLUS_COMMENTS_URL . '/font/font.css', null, GPLUS_COMMENTS_VERSION, "all");
wp_register_style('gplus_comments_tabs_css', GPLUS_COMMENTS_URL . '/styles/tabs.css', array("gplus_comments_font"), GPLUS_COMMENTS_VERSION, "screen");
wp_register_script('gplus_comments_tabs_js', GPLUS_COMMENTS_URL . '/js/tabs.js', array('jquery-ui-tabs'), GPLUS_COMMENTS_VERSION, true);
wp_enqueue_script('jquery');
wp_enqueue_script('jquery-ui-core');
wp_enqueue_script('jquery-ui-tabs');
}
add_action('init', 'gplus_comments_init');