line 375 in wp-includes/media.php
change 10 to 0
return ‘<div ‘ . $id . ‘class=”wp-caption ‘ . $align . ‘” style=”width: ‘ . (10 + (int) $width) . ‘px”>’
I’m not seeing the entry in media.php that adds the 10px. Perhaps I’m missing something. I’m using wordpress 2.6.3