Drop Menu Add-On - Page Below Vanishes!

[OldWest]

I am running Zen Cart version: 1.3.9g.

I currently "installed" the: CSS Horizontal Drop Down Menu

I did notice the menu is noted noted to support the version of Zen Cart I am running, but I don't think the effects that are resulting are due to this.

The menu works perfectly fine in terms of appearing, but when I add it to the header, anything below the menu vanishes! The page just blanks out.

I checked the html output in View Source, and it appears ALL normal code is showing, but none of it is resolving on the page... So it's just a blank white screen below the menu???

It's no matter where I ad this below in the header, throws everything out of whack as described above.

<!--bof-drop down menu display-->
<?php require($template->get_template_dir('tpl_drop_menu.php',DIR_WS_TEMPLATE, $current_page_base,'common'). '/tpl_drop_menu.php');?>
<!--eof-drop down menu display-->

Please anyone experience this? SOS.

[schoolboy]

In the cache folder there will be an error log file. Take a look at it to see where the break is occurring.