I have been trying to learn how to use EZNEC. I got the (fully functional)
demo version and began the tutorial in the help file to learn how to use the
software. I opened the dipole file and tried to change the frequency but
when I click in the frequency field, nothing happens and I can't modify
anything. I uninstalled, re-downloaded, and re-installed the software. Same
problem.

Has anyone else experienced this with EZNEC? Any ideas?