Dropdown menu doesn't show up

Hello!
I recently found out that my drop down menu on http://www.sofistik-jivo.com doesn’t show up. It used to be there a week or so ago, but not any longer.
I’m using a free theme which supports 2 menus that used to work perfectly until now.
I think I’ve done everything right at the Appearance > Menu Section, because it worked before. Here is a screenshot

Ane I guess this below is the code that refers to the MENUS in my functions.php.
I’m quite new to WordPress so I’d appreciate any help! Thank you!

function smt_menu($a) {
		$a=preg_replace("/<ul\sclass='children'>/", "<ul class='children'$2><div class='transparent'></div><div class='inner'>", $a);
		$a=preg_replace('/<ul\sclass="sub-menu">/', "<ul class='sub-menu'><div class='transparent'></div><div class='inner'>", $a);
		$a=preg_replace("/<\/ul>/", "</div></ul>", $a);
		return $a;
	}
	add_filter('wp_list_categories', 'smt_menu');
	add_filter('wp_list_pages', 'smt_menu');
	add_filter('wp_nav_menu_items', 'smt_menu');
	function block_main_menu() {
	global $SMTheme;
		?>
		 <div class="menu-primary-container">
			<ul class="menus menu-primary">
                <li <?php if(is_home() || is_front_page()) { ?>class="current_page_item"<?php } ?>><a href="<?php echo home_url(); ?>/"><?php echo $SMTheme->_(  'homelink' );?></a></li>
				<?php wp_list_categories('title_li=&'); ?>
			</ul>
		</div>
		<?php
	}

	function block_sec_menu() {
		?><div class='menu-topmenu-container'><ul class="menus">
				<?php wp_list_pages('title_li=&'); ?>
			</ul></div>
		<?php
	}
	function block_sec_menu_mobile() {
		?>
		<script>
			jQuery(document).ready(function(){
				jQuery('.menu-topmenu-container li').each(function() {
					jQuery('<option />', {
					'value':jQuery(this).find('a').attr('href'),
					'text':jQuery(this).find('a').html()
					}).appendTo(jQuery('#mobile-sec-menu'));
				});
			});
		</script>
		<?php
	}
	function block_main_menu_mobile() {
		?>
		<script>
			jQuery(document).ready(function(){
				jQuery('.menu-primary li').each(function() {
					jQuery('<option />', {
					'value':jQuery(this).find('a').attr('href'),
					'text':jQuery(this).find('a').html()
					}).appendTo(jQuery('#mobile-main-menu'));
				});
			});
		</script>
		<?php
	}

	function smt_mobile_menu($menu_name) {
		echo '<select class=\'mobile-menu\' id=\'mobile-'.$menu_name.'\'>';
		echo '<option value=\'#\'>Go to ...</option>';
		 if ( ( $locations = get_nav_menu_locations() ) && isset( $locations[ $menu_name ] ) ) {
			$menu = wp_get_nav_menu_object( $locations[ $menu_name ] );
			if ($menu_items = wp_get_nav_menu_items($menu->term_id)) {
				$sub=array();
				foreach ($menu_items as $key => $menu_item ) {
					if ($menu_item->menu_item_parent==0) $sub[$menu_item->ID]=''; else $sub[$menu_item->ID]=$sub[$menu_item->menu_item_parent].'- ';
					echo '<option value=\''.$menu_item->url . '\'>' .$sub[$menu_item->ID]. $menu_item->title . '</option>';
				}
			} else {
				$func='block_'.preg_replace('/-/', '_', $menu_name).'_mobile';
				if (is_callable($func)) {
					$func();
				}
			}
		} else {
			$func='block_'.preg_replace('/-/', '_', $menu_name).'_mobile';
			if (is_callable($func)) {
				$func();
			}
		}
		echo '</select>';
	}