Ryan,
Thanks for the quick reply and the friendly welcome! The odd thing is, I'm not using ANY sort of caching system on my Drupal install at all! It's not anything dealing with the e-Commerce module either, as I made sure to clear out any files and entries in the database prior to messing with Ubercart. As soon as I changed the code above, everything went smoothly. To reiterate, I did need to make these changes when installing Beta 4. I downloaded Beta 4 from the Drupal.org Ubercart project page.