1. I made sure to check the data files for strange behavior, definitely a good idea. I know when I use other software such as ROOT, file structure and pat names can become problems. This didn't fix the problem, however :-/ 2. I then ran Athena from the command line as was suggested, and it seems that there is a major problem there: bash-3.2$ athena Can't load '/Applications/iXAFS.app/Contents/Resources/local/lib/perl5/site_perl/5.12.1/darwin-multi-2level/auto/Ifeffit/Ifeffit.bundle' for module Ifeffit: dlopen(/Applications/iXAFS.app/Contents/Resources/local/lib/perl5/site_perl/5.12.1/darwin-multi-2level/auto/Ifeffit/Ifeffit.bundle, 1): Library not loaded: libifeffit.so Referenced from: /Applications/iXAFS.app/Contents/Resources/local/lib/perl5/site_perl/5.12.1/darwin-multi-2level/auto/Ifeffit/Ifeffit.bundle Reason: image not found at /Applications/iXAFS.app/Contents/Resources/local/lib/perl5/5.12.1/darwin-multi-2level/DynaLoader.pm line 204. at /Applications/iXAFS.app/Contents/Resources/local/bin/athena line 67 Compilation failed in require at /Applications/iXAFS.app/Contents/Resources/local/bin/athena line 67. BEGIN failed--compilation aborted at /Applications/iXAFS.app/Contents/Resources/local/bin/athena line 67. 3. Then I became more curious and attempted ifeffit itself: bash-3.2$ ifeffit dyld: Library not loaded: libpgplot.dylib Referenced from: /Applications/iXAFS.app/Contents/Resources/Horae/bin/ifeffit Reason: image not found Trace/BPT trap I am using Max OSX 10.6.8. Intel Core i5. Any other Mac users out there have ideas? Thanks much, Tony Kelly Air Force Institute of Technology Nuclear Physics and Engineering