I will be back to work on User Details in the next month.
If you are reporting a issue please make sure to give as much information as possible so I can re-produce the issue.
The "User Details" module comes with two blocks, "User Detils: logged-in user" and "User Details: authored user".
The idea for "User Details" started as a request from an end-user, to have a centreal place for quick links to important locations on the website.
For Drupal 6 this was just some custom code you could add to a custom block.
For Drupal 7 the "User Details" module has expanded to its own module, which allows non-coders to alter and customize to thier liking.
The "User Details" module is a basic collection of user data (or variables) and commonly used links in a block. In no way is this a required part of any website, only for the ease of naviagtion.
Below is a list of all the stats and links that can be turned on as part of the "User Details" blocks.The links come with some default images, but you can change these by uploading an image to your web server and typing in the location for each image.
User Details: logged-in user