Hello, I recently upgraded to OS 10.6 (snow leopard) on my intel Mac. It comes with version 2.3.4 of X11. Now, I can't seem to run any of the Horae GUI applications! I've tried launching Athena from iXAFS or from the stand alone IFEFFIT suite. When I run iXAFS, the normal launch window with Athena, Artemis, Hephaestus and the iXAFS shell appears. Clicking on the Athena, Artemis, and icons Hephaestus causes X11 to launch with an xterm window, but Aquaterm does not load. However, the iXAFS shell seems to load, though I'm not experienced enough with the shell to know if it's fine or not. Upon launching the Athena standalone program from IFEFFIT (downloaded here: http://cars9.uchicago.edu/~ifeffit/src/Ifeffit-1.2.10-Mac10.4_Intel_horae066...), clicking on "X11 graphics" launches xterm but not Aquaterm, and clicking on "Aquaterm" closes the program. Not sure if this is a Snow Leopard related problem or not- there has been a new version of X11 released (2.4) that is unsupported in OS 10.6, and unfortunately it doesn't seem to allow me to install a previous 2.3.2 version. Looks like I'll have to downgrade back to Leopard, these cat names are getting confusing. Has anyone experienced anything similar, or have any insight on how to fix the problem? Best regards, Joel Kelly University of Alberta