Hello,
I am running Athena 0.9.20 on OSX 10.8.5. Selecting the difference spectra tool from the drop-down menu causes Athena to crash and the following message to print to the terminal.
Usage: Wx::ComboBox::GetClientData(THIS, n) at /opt/local/lib/perl5/site_perl/5.16.3/darwin-thread-multi-2level/Demeter/UI/Athena/Difference.pm line 215, <F> line 339.
I've tried this with several different projects and it appears to be general behavior. If I can provide any additional information please let me know.