我正在开发一个WordPress主题，它在我的本地主机和一个live server上运行得很好，但在我的另一个live server上，小部件菜单（从外观）不会出现。是的，所有3台服务器都有相同的3.6.1 WordPress版本，主题文件也相同。知道这是什么原因吗？

这是functions.php 注册小部件区域：

if (function_exists(\'register_sidebar\')) {
register_sidebar(array(
    \'name\' => \'RLTheme - Footer Left\',
    \'id\'   => \'rltheme_footer_left\',
    \'description\'   => \'The left area of the footer.\',
    \'before_widget\' => \'\',
    \'after_widget\'  => \'\',
    \'before_title\'  => \'<h3>\',
    \'after_title\'   => \'<span></span></h3>\'
));

register_sidebar(array(
    \'name\' => \'RLTheme - Footer Center\',
    \'id\'   => \'rltheme_footer_center\',
    \'description\'   => \'The center area of the footer.\',
    \'before_widget\' => \'\',
    \'after_widget\'  => \'\',
    \'before_title\'  => \'<h3>\',
    \'after_title\'   => \'<span></span></h3>\'
));

register_sidebar(array(
    \'name\' => \'RLTheme - Footer Right\',
    \'id\'   => \'rltheme_footer_right\',
    \'description\'   => \'The right area of the footer.\',
    \'before_widget\' => \'\',
    \'after_widget\'  => \'\',
    \'before_title\'  => \'<h3>\',
    \'after_title\'   => \'<span></span></h3>\'
));

register_sidebar(array(
    \'name\' => \'RLTheme - Sidebar Left\',
    \'id\'   => \'rltheme_sidebar_left\',
    \'description\'   => \'The right sidebar area.\',
    \'before_widget\' => \'<div class="sidebar_area">\',
    \'after_widget\'  => \'</div>\',
    \'before_title\'  => \'<h3>\',
    \'after_title\'   => \'</h3>\'
));

register_sidebar(array(
    \'name\' => \'RLTheme - Sidebar Right\',
    \'id\'   => \'rltheme_sidebar_right\',
    \'description\'   => \'The left sidebar area.\',
    \'before_widget\' => \'<div class="sidebar_area">\',
    \'after_widget\'  => \'</div>\',
    \'before_title\'  => \'<h3>\',
    \'after_title\'   => \'</h3>\'
));
}

另外，如果我从我的主题切换到默认主题（在激活主题时无法看到“小部件”菜单的实时服务器上），我可以看到“小部件”菜单，因此那里的WordPress安装似乎不会中断。