This program has been very helpful for me -- I live thousands of miles away from my parents but they turn to me for computer help, which can be tough to give with the distance. So I set up VNC on their computer and installed IP Reporter to notify me of their external (outside their router) IP address. I also installed a copy on a G4 acting as a server so I can use it as a web & FTP server. Program worked well on both computers for a little while then suddenly stopped aquiring and reporting the external IP on both machines.
Turned out that the preference file was "forgetting" the settings. I did some research and found others with the same problem, but no solution posted anywhere.
My solution: set IP Reporter preferences the way you want, quit, and find the preferences file in ~/library/preferences/, get info on it, and lock the file. Since I did this, the program has been working flawlessly on both machines. Aside from this one issue, however, it is a great program and I've found it very useful.