freeradius 2 problem

Hi, I have a working radius server using freeradius 1.1.7. I am trying to upgrade to freeradius 2. Using radtest, I get a reply, but the radgroup reply data is not included in the reply. I probably have one of the configuration files done wrong. My question is: which configuration files are necessary when using freeradius 2? Sincerely, Don James