[Plugin: Co-Authors Plus] Found a bug; Solution included

I ran into an issue with your plugin when using it with my customized theme. My theme runs a wp_query to get all posts from a particular category and then based on some other criteria pulls out a random header image from one of those posts. Anyway, my code:
$my_query = new WP_Query('showposts=20&category_name=header');
was not generating any results when I viewed the author page (/author/username). Digging in, I found that it was running this query:

SELECT SQL_CALC_FOUND_ROWS  wp_posts.* FROM wp_posts
INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)
INNER JOIN wp_term_relationships ON ( wp_posts.ID = wp_term_relationships.object_id)
INNER JOIN wp_term_taxonomy ON ( wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id ) WHERE 1=1  AND ( wp_term_relationships.term_taxonomy_id IN (28) ) AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private') GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 20

I tracked the problem back to the posts_join_filter function in your plugin. I changed the function to check for each join separately instead of as a group and that solved the problem. Here’s the new code if you want it:

function posts_join_filter( $join ){
		global $wpdb, $wp_query;

		if( is_author() ){
			// Check to see that JOIN hasn't already been added. Props michaelingp
			$join_string1 = " INNER JOIN {$wpdb->term_relationships} ON ({$wpdb->posts}.ID = {$wpdb->term_relationships}.object_id)";
			$join_string2 = " INNER JOIN {$wpdb->term_taxonomy} ON ( {$wpdb->term_relationships}.term_taxonomy_id = {$wpdb->term_taxonomy}.term_taxonomy_id )";
			if( strpos( $join, trim($join_string1) ) === false ) {
				$join .= $join_string1;
			}
			if( strpos( $join, trim($join_string2) ) === false ) {
				$join .= $join_string2;
			}
		}

		return $join;
	}

If you could add this to the plugin I’d be really happy. Hope it helps.
Thanks,
Nate