Very short post today. An annoying issue in WPEC that is very easily fixed. If you are using UPS as your shipping method and Ground shipping does not display. Possibly applies to other methods too, I am not sure. So if you have a shipping method set but it just refuses to show this could be the answer.
I found the answer on getShopped forums, thanks to user EleGenius.
Change the ‘Packaging’ option to ‘Your Packaging’, this option seems to be the only option that will bring back the Ground Shipping Option.
If you can not use “Your packaging” then you will need to try try getshopped forums, at that point it is beyond my knowledge.