C Reign,
The sprite I linked has a number of options that we are not using, and is missing Tumblr completely which we are using (Facebook, Twitter, Stumbleupon, Reddit, & Tumblr are currently selected.) If you mouse over the line, past Reddit – you will find the link for Tumblr, but no graphic.
This problem still exists for our install. If I break the SpriteGen folder (remove write permissions), the plugin falls back to using the original graphic. The sprite I linked should only have the five icons I listed above and that is not what it is actually generating.