WordPress MU

Hi, I am having a problem with switch_to_blog and restore_current_blog.

WPMU switches to the new blog, but doesn't seem to switch back properly. My code is below. I'd like to switch to a blog, gets some posts, and switch back. The final the_content in the code should show content from the original blog's posts, but it shows the last entry gotten from the blog that's been switched to.
commenting out setup_postdata($post); seems to help a little. the_content works, but the_title does not.

I'm perplexed. Thanks for any help.

--

global $switched;
    switch_to_blog(15);
        $lastposts = get_posts('numberposts=3');
        foreach($lastposts as $post) :
                setup_postdata($post);
                the_excerpt();
                get_the_image();
        endforeach;
    restore_current_blog();  

the_content(); // this should print the_content from the original blog page/post

You need to call get_posts again after you restore_current_blog(). get_posts creates a cache of the last call it had.

Also, what is global $switched supposed to do?

Thanks. I copied global $switched from the sample code here:

http://codex.wordpress.org/WPMU_Functions/switch_to_blog

I appreciate your help. I'll take a closer look. Thanks.