Hi Milo,
What I am seeing is that it is still redirecting to this page

http://relativeu.com/log-in-after-registration/

Are you using some code/plugin to do this?

Just had a look.
You are using a user access restriction plugin/code which is incorrectly redirecting the logged in user. It should not do that in case the ajax action is being handled.

Which plugin or code are you using?

Hi Deepak,
i have pushed the release. Please try upgrading and let me know how it goes.

Please do see this post for upgrade info
https://buddydev.com/support/forums/topic/upgrading-to-mediapress-with-sitewide-wordpress-gallery-support/

Ok,
Here is a slightly modified version of your last function

function list_author_used_terms($author_id){

    // get the author's posts
    $posts = get_posts( array('post_type' => 'post', 'posts_per_page' => -1, 'author' => $author_id) );
    $author_terms = array();
    //loop over the posts and collect the terms
    foreach ($posts as $p) {
        $terms = wp_get_object_terms( $p->ID, 'collection');
        foreach ($terms as $t) {
            $author_terms[$t->term_id] = $t;
        }
    }
    return $author_terms;
}

and here is an example use

$terms = list_author_used_terms( 1 );
$links = array();
foreach( $terms as $term ) {
	$links[] =  sprintf( "<a href='%s'>%s</a>", get_term_link( $term ), $term->name );
}

echo join( '', $links );

Hope that helps.

You have some plugin/rewrite rules causing this issue. If I directly try to access the mediapress image, I see this message

WPPP dynamic images deactivated for this site

Can you please look into that.