This is an awesome plugin! Have been looking for something as flexible as this for a long time.
I do have one small hangup - the path for the thumbnails isn't correct. Somehow in this line:
$thumbcode = str_replace( $current_blog->domain . $current_blog->path, $blogdetails->domain . $blogdetails->path, get_the_post_thumbnail( $post_id, $size, $attrs ) );
the current blog is published twice, giving me a src path for the image that looks something like this:
I've tried commenting out the second path name, but the url is then missing a / - can't seem to work it out.
thanks for your help!