[Elecraft] spectrogram no signal

[John Cooper]

OK I finally downloaded the free spectrogram ver 5.17 running on windows 7 it comes up set like on NOSS site says too have a noise generator hooked up to antenna.  Headphone jack to line in jack on computer can hear noise thru speakers.  But nothing shows up on spectrogram just white screen.  Tried running in compatibility mode for win 95 xp and vista.  any ideas?

WT5Y