Sidebar/widget problem – default sidebar appearing instead?

I registered some new sidebars and put my call in the .php file that needs it. However, I don’t get my widget, but what appears to be a default sidebar instead.

the size and position are right; the stuff is wrong. my code below. Is there a hint here if I’m getting this generic sidebar, like maybe I missed some bit somewhere?

thank you for any clues!

wplearner

from my functions.php

/* Register the design thumb sidebar. */
	register_sidebar(
		array(
			'id' => 'design-thumb',
			'name' => __( 'Design thumbnail' ),
			'description' => __( 'shows design thumbnail on portfolio gateway' ),
			'before_widget' => '<div id="%1$s" class="widget %2$s">',
			'after_widget' => '</div>',
			'before_title' => '<h3 class="widget-title">',
			'after_title' => '</h3>'
		)
	);

from my page:

<?php get_sidebar('design-thumb'); ?>