To all who are using 1.3.7 and 1.3.8, please upgrade your cart to at least 1.3.9, or better yet 1.5.0. Using old zen cart versions is a security risk. It is possible that VISA/Mastercard will revoke your privileges to accept credit cards (as stipulated by PCI regulations), or worse - your customers could fall victim to cyber crime.

Regarding the admin menu issues in 1.5.0, I have uploaded a new version of the plugin here:

http://jtwebsitedesign.net/zen/USPS....-fill-v1.5.zip
(Please overwrite existing files, and run install-1.5.0.sql)