Can Someone Help with this Issue Please..?

I’m sorry to post multiple x’s but I’ve got no response for the last 5 post I’ve made.

I have a page ‘page-photos.php’. On this page for my content div, I call get_template_part('loop', 'photos');

For some very strange reason, loop.php acts differently with pages because it didn’t show ANYTHING between the <div id=”content”></div> until I took out the line:

<?php if ( in_category( _x('gallery', 'gallery category slug', 'twentyten') ) ) : ?>

…even though my galleries are categorized as ‘gallery’..

this is indeed weird….I’m thinking there’s a difference between loop.php for pages and loop.php for posts…can someone help explain this difference…