Question: I am using magento community version 1.8.1. I am using FedEx for shipping method.

I enabled several method like 'First Overnight','2 Day','Priority Overnight','Standard Overnight','Ground' and 'International Ground' from admin.

But only four are appearing in front end. 'Ground' and 'International Ground' is not appearing.

Can anyone help me on this ?

Answer: 
I had the same issue. After turning just about every option on and off. I figured out that if the field for "Residential Delivery" is set to 'Yes'. Ground is turned off, but you can select "Home Delivery".

**Solution!**

Switch "Residential Delivery" to "Off", this allowed the ground option to display on checkout and estimate page. Not sure if that is a Magento or FedEx API thing, I don't really care to explore it atm. Maybe one of you guys can look into it, for a better fix.
Turning *Residential Delivery* to *No* worked for me.