Try locating your navigation code
you mean the code for navcattabs? it's very brief, and in my tpl_header.php:
Code:
<!--bof-optional categories tabs navigation display-->
<?php //require($template->get_template_dir('tpl_modules_categories_tabs.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_categories_tabs.php'); ?>
<div id="navCatTabsWrapper">
<div id="navCatTabs">
<!-- bof breadcrumb -->
<div id="navBreadCrumb"><?php echo $breadcrumb->trail(BREAD_CRUMBS_SEPARATOR); ?></div>
<!-- eof breadcrumb -->
<div align="right"><?php require(DIR_WS_MODULES . 'sideboxes/search_header.php'); ?></div>
</div>
</div>
<!--eof-optional categories tabs navigation display-->
and what you have defined as .masthead in the tpl_header.php file
i don't know what you mean by masthead. do you mean the logo wrapper? hte word "masthead" isn't in my tpl_header file and didn't show up in a site-wide developer's toolkit search.
and use the Zen def's so that this responds to tweaks that work for Zencart.
as far as i remember, i haven't altered the definitions of any of the div's. i've edited tpl_header only by cutting and pasting and commenting out items i don't want. i also changed some of the align= , i think.
am i understanding you correctly?