Форумы / Cotonti / Support / Editors not working on new Siena install

Are you using a old skin(for genoa) or a new skin(specially made for Siena)?

Because the tag for the textboxer has changed.

eg. For comments:
Before: {COMMENTS_FORM_TEXTBOXER}
Now: {COMMENTS_FORM_TEXT}

For forums.newtopic.tpl
Before:{FORUMS_NEWTOPIC_TEXTBOXER}
Now: {FORUMS_NEWTOPIC_TEXT}

Find the tags and remove "boxer"

Make sure that CKeditor is installed, Markitup and BBcode de-installed.