No toolbar is shown

[Guite]

Trying to use Aloha 1.4.23 with a textarea.

The following stuff is embedded in the head area:

<link rel="stylesheet" href="/src/js/aloha/css/aloha.css" type="text/css">
...
<script type="text/javascript" src="/src/js/jquery/jquery.min.js"></script>
<script type="text/javascript" src="/src/js/bootstrap/js/bootstrap.min.js"></script>
<script type="text/javascript" src="/src/js/html5shiv/dist/html5shiv.js"></script>
<script type="text/javascript" src="/src/js/aloha/lib/require.js"></script>

<script src="/src/js/aloha/lib/aloha.js"
       data-aloha-plugins="common/ui,common/abbr,common/align,common/block,common/characterpicker,common/commands,common/contenthandler,common/format,common/highlighteditables,common/horizontalruler,common/image,common/link,common/list,common/paste,common/table,common/undo,extra/toc,extra/validation">
</script>
<script type="text/javascript">
/* <![CDATA[ */
    (function($) {
        $(document).ready(function() {
            Aloha.ready( function() {
                Aloha.jQuery('#myTextArea').aloha();
            });
        });
    })(jQuery)
 /* ]]> */
</script>

The textarea gets a yellow/orange border and I see a sidebar menu at the right. When clicking on a link inside the textarea this sidebar contains a link section allowing to change the link target as well as other attributes.
So Aloha is working in general. The JS console does not output any error.

But I can not see the toolbar which allows to insert new elements, like headlines and so on. Below is a screenshot of the DOM elements. You can see there is a <div class="aloha aloha-surface aloha-toolbar"> which is hidden though and has no child elements.

Any idea what could be wrong?

[Guite]

Could be the same problem as #1477