Be careful ladies and gentlemen when updating the Digg Digg plugin right away. It is quite often that this plugin updates and pretty much puts out errors.
This time around, not so bad. The manual code has been changed in so if you are using that method, you will have PHP errors show up. Not fun if you have a site that has a good amount of traffic. This is not a problem if you are using a previous version that you had no problems with.
Like most plugins, never update right away – Digg Digg especially. Give it about a week. You never know, especially if a plugin developer accidentally loaded up the files and missed an important one.
In the case you accidentally loaded the plugin and it does not work even after changing the manual method code to the new ones, you will need to deactivate, and delete the new version. To replace, go back to the Digg Digg plugin at WordPress.org’s Plugin directory, download the previous version, and then install it.
It is usually something by accident, but after repeated issues with Digg Digg updates, I think it might be a good thing to throw the caution out there to the community.