[Ifeffit] Mac OS 10.4.11 upgrade and no more Ifeffit

Hi, I had a working version of Ifeffit 1.2.9 on my mac powerbook G4 but after upgrading to 10.4.11, Athena, Artemis and Hephaestus briefly launch, give a display option and then promptly die. Feff6 works fine and I have X11 installed. Any good ideas? I've tried deleting files from Applications/Ifeffit, /Library/Perl and /Library/Receipts/Ifeffit-.* and reinstalling. I guess it has something to so with Tk but I'm unsure which version to install and whether that is really the problem. Suggestions very welcome! Cheers, Andrew