While doing a source dump in trying to figure out why the StumbleUpon icon is displaying several pixels off from where it should be, I noticed a typo in sociable_output.php
Around line 366, there is a typo:
$link = '<li style="heigth:'.$sociable_options['icon_size'].'px;width:'.$sociable_options['icon_size'].'px">';
The word "height" is typoed as "heigth".
It should be:
$link = '<li style="height:'.$sociable_options['icon_size'].'px;width:'.$sociable_options['icon_size'].'px">';
You will want to correct this.