WordPress 3.9 will be released soon. When it is released, older versions of Weaver II or Aspen will no longer work correctly with the WordPress Page/Post editor.
The latest versions are Aspen 1.1.11 and Weaver II 2.1.10 (free and Pro).
WordPress 3.9 includes a completely new version of the TinyMCE editor, and older versions of Aspen and Weaver II will not show proper styling when using the editor. Your site will continue to work as before, but you will only see generic styling when you edit posts or pages until you update to the latest versions.