Решить проблему с показом редактора - TinyMCE в настраиваемом поле редактор, можно правкой кода в файле
administrator\components\com_virtuemart\models\customfields.php
Ищем там строку:
//'X'=>'COM_VIRTUEMART_CUSTOM_EDITOR'
и заменяем код:
<script type="text/javascript">// Creates a new editor instance
tinymce.execCommand("mceAddControl",true,"field-' . $row . '-customfield_value")
</script>';
на код:
<script type="text/javascript">// Creates a new editor instance
tinymce.execCommand("mceAddControl",true,"field-' . $row . '-customfield_value")
tinyMCE.init({
selector: "textarea.mceInsertContentNew",
height: 500,
theme: "modern",
plugins: "print preview searchreplace autolink directionality visualblocks visualchars fullscreen image link media template codesample table charmap hr pagebreak nonbreaking anchor toc insertdatetime advlist lists textcolor wordcount imagetools contextmenu colorpicker textpattern code",
toolbar1: "bold italic strikethrough forecolor backcolor | alignleft aligncenter alignright alignjustify | numlist bullist outdent indent | formatselect fontselect fontsizeselect | removeformat | link | code",
image_advtab: true,
});
</script>';