I just downloaded the most recent version of this contribution uc_civicrm-6.x-3.0-2.2-1(linked above) and installed it on a Drupal 614 CiviCRM 303 (php 5.2.6 Mysql 5.0.58) UberCart 2.2 site and got the same problem. It did create an activity record on the contact record in civicrm, It did create and add the contact to the purchases group, But it did not copy over the address information.
I don't know if it matters, but I only had billing address filled in not delivery since I was testing as "payment by check"
I tried it on two diff users on my setup.
Thanks for any assistance and the module.