Hi Stroudsco
At the moment the plugin category archives is still calling the standard WordPress category description.
You can download my plugin CategoryTinymce from WordPress and that gives you tinymce and shortcode abilities to the default description box.
I stopped support for the free plugin at wp3.9 but the top description still works. It might be a suitable stop gap measure until this plugin is fixed and then you just need to cut and paste across.
Kevin