I am using 1.3.9h
I added the following mod's in this order:
*Column Layout Grid
*Buttons from zen button construction (not really a mod)
*Online Group Pricing
*image handler 3
*USPS Shipping Module - RateV4, IntlRateV2

Since others are successfully using this mod, I must conclude that I am doing something wrong, or not understanding it correctly.

It appears I have a successful install, however, none of the domestic quote options appear during checkout. Additionally, all of my shipping rates have doubled since installing. Prior to install, first class and priority were showing as they should in the standard zen version of USPS shipping.

I have very lightweight products, and set the weight of each to .0625 (an ounce). I really only installed this mod to be able to add insurance. The insurance mod didn't seem to be a viable solution as it appears out of date and not compatible with 1.3.9h.

Store is live. Shipping rates with one .0625lb item show as follows:
First-Class Mail Package (2 days) $4.66
Priority Mail (1 day) $8.05
Priority Mail Small Flat Rate Box (1 day) $8.15
Priority Mail Medium Flat Rate Box (1 day) $13.90
Priority Mail Large Flat Rate Box (1 day) $17.90

help please?