My site is currently a vanilla installation and I have no problems with TinyMCE - it displays for groups / blogs and normal forums.
Tiny MCE requires the following to function correctly.
Tiny MCE code - should be in plugins / tiny_mce
Javascript headers - below is the javascript header from my site .....blogs.php?action=new_post
Hope this help
<script type="text/javascript" src="http://www.mysite.com/plugins/tiny_mce/tiny_mce_gzip.js"></script>
<script type="text/javascript">
tinyMCE_GZ.init({
plugins : "style,layer,table,save,advhr,advimage,advlink,emotions,iespell,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras",
themes : "simple,advanced",
languages : "en",
disk_cache : true,
debug : false
});
</script>
<script language="javascript" type="text/javascript">
// Notice: The simple theme does not use all options some of them are limited to the advanced theme
tinyMCE.init({
mode : "textareas",
theme : "advanced",
//content_css : "templates/tmpl_uni/css/editor.css",
editor_selector : "blogText|guestbookTextArea|story_edit_area|comment_textarea|classfiedsTextArea",
plugins : "table,save,advhr,advimage,advlink,emotions,iespell,insertdatetime,preview,zoom,media,searchreplace,print,contextmenu,paste,directionality,fullscreen",
theme_advanced_buttons1_add : "fontselect,fontsizeselect",
theme_advanced_buttons2_add_before: "cut,copy,paste,pastetext,pasteword,image,separator,search,replace,separator",
theme_advanced_buttons2_add : "separator,insertdate,inserttime,separator,forecolor,backcolor",
theme_advanced_buttons3_add : "emotions",
theme_advanced_toolbar_location : "top",
theme_advanced_toolbar_align : "left",
theme_advanced_statusbar_location : "bottom",
plugi2n_insertdate_dateFormat : "%Y-%m-%d",
plugi2n_insertdate_timeFormat : "%H:%M:%S",
paste_use_dialog : false,
theme_advanced_resizing : false,
theme_advanced_resize_horizontal : false,
theme_advanced_link_targets : "_something=My somthing;_something2=My somthing2;_something3=My somthing3;",
paste_auto_cleanup_on_paste : true,
paste_convert_headers_to_strong : false,
paste_strip_class_attributes : "all",
paste_remove_spans : false,
paste_remove_styles : false
});
</script>