WP 3.2.1, No Cache Plugins installed yet.
WP Super Edit 2.4.2 works beautifully with Posts and Pages Visual Editor.
But not with Mailpress's Mail Visual Editor, only shows WordPress's Default buttons in Editor.
Mailpress plug-in dev says:
"MailPress Mail editor is calling Tinymce as it is called by the Post editor so maybe WP Super Edit plug-in dev could fix that?"