Quote - IF SM had written P9-MAC edition to use a better version of Python OR Python was back-compatible re. compiled versions of code, this problem wouldn't arise. We always seem to be suffering at the hands of unseen, incompetent others in the computer industry, such is the developer's lot. C'est la vie!

TkInter support on Macs has been broken for a long while, and isn't SM's fault, it doesn't work in the vanilla Python distribution. If you want a cross platform GUI for a Poser script, you'll need to switch to wxPython (for P8 and above)