Hi Matt, I've just tried installing IFEFFIT (using "install Ifeffit on Tiger") on a new Mac running 10.4. The installer apparently runs to completion, but when I go to the application folder and double-click on the apps themselves (e.g., Artemis), they appear to open up but then immediately close down to the Finder again in less than a second. At the XAFS Summer School I remember this problem on newly-installed machines: we had to download a program from the Apple website (X-server?), although I can't recall what this is... Conscious that this is an old problem, I tried looking in the archives, but without search capabilities I didn't find the right thread... Any assistance would be appreciated, Best, Tonio