Guest greeting message vanished from mobile style ... mobile navbar div is gone from rendering (obviously related)

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This is on a vB 4.2 installation using a Metro Mobile skin as a mobile style. It is running as my test site. The greeting notice (for unregistered / not logged in users) displays fine in full site mode. Approximately one week ago the mobile version displayed the greeting notice fine as well. Nothing seems wrong in the ACP > Notices section.

The following should be displayed when I view the page source. But for some reason it isn't. I would like to understand why.

<div id="navbar" class="navbar">
    <ul class="breadcrumb" data-role="listview" data-theme="d">
        <li data-theme="a">Navigation</li>

    </ul>


        <form action="profile.php?do=dismissnotice" method="post" id="notices" class="notices">
            <ol>
                <li id="navbar_notice_1" class="ui-body ui-body-e navbar_notice_1">


                                    NOTICE TEXT CONTENT

</li>
            </ol>
            <input type="hidden" name="do" value="dismissnotice" />
            <input type="hidden" name="s" value="" />
            <input type="hidden" name="securitytoken" value="guest" />
            <input type="hidden" id="dismiss_notice_hidden" name="dismiss_noticeid" value="" />
            <input type="hidden" name="url" value="" />
        </form>

</div>

Does anyone know what might account for this problem?

[edgeless]

Stated another way, what can cause the mobile navbar template to be ignored during page load?