Replace from “user-photo.php” line 112:
$img = userphoto__get_userphoto($userid, (abs($full_dimension - $size) < abs($small_dimension - $size)) ? USERPHOTO_FULL_SIZE : USERPHOTO_THUMBNAIL_SIZE, '', '', array(), '');
with:
$img = userphoto__get_userphoto($userid, (abs($full_dimension - $size) < abs($small_dimension - $size)) ? USERPHOTO_FULL_SIZE : USERPHOTO_THUMBNAIL_SIZE, '', '', array(width => $size, height => '100%'), '');
that will rezolve all problem with size.
For autor: pls. consider that on next update!