for fixed width photos and thumbnails generation in file user-photo.php
comment this lines (line 852)
// figure out the longest side
//if ( $info[0] > $info[1] ) {
$image_width = $info[0];
$image_height = $info[1];
$image_new_width = $maxdimension;
$image_ratio = $image_width / $image_new_width;
$image_new_height = $image_height / $image_ratio;
//width is > height
//} else {
// $image_width = $info[0];
// $image_height = $info[1];
// $image_new_height = $maxdimension;
// $image_ratio = $image_height / $image_new_height;
// $image_new_width = $image_width / $image_ratio;
//height > width
//}
enjoy :))