In the tag cloud for K2 Joomulus URL's fail because they do not recognize the characters Latinos, to solve this problem we need to edit the file modules/mod_k2_joomulus/helper.php approximately in line 36 and replace:
Original code:
$tagcloud .= "<a href='".$tag->link."&Itemid=5' target='".$tag->target."' style='font-size:".$tag->size."%'>".$tag->tag."</a>\n ";
Replace:
$tagcloud .= "<a href='".utf8_encode($tag->link)."&Itemid=5' target='".$tag->target."' style='font-size:".$tag->size."%'>".$tag->tag."</a>\n ";