If USPS is the only shipping module published than it is not shown.

[aravot]

Joomla 1.0.12
VM 1.1 r935

This was working in build 928 either something changed between builds or my site is playing games on me, If USPS module is the only shipping module published it won't show on checkout page but if I use FedEx and USPS than it works fine, confirmation needed.

Edited
I know what I did wrong , forgot to put product weight but the question arises from this how come when there is another shipping modulepublished USPS shows?

I don't know if this is controlled by VM or USPS isn't it better to display a message e.g. Product weight or dimension not selected, instead of not showing USPS shipping rates.