Thanks everyone for the help. I sent a PM to greenpots to ask him for advice. It's not just his scripts that use Tkinter - I have several from other sources as well. My Google searches indicate that Tkinter is an interface for Python. So, anything that just runs works fine (like a "copy scaling" script I use for short characters' clothing), but anything more complicated crashes. For example, a "delete" script from D3D that lets you select multiple figures/objects to delete all at once. I agree that some of the stuff I can just do manually if I have to, but it would be a huge time saver if I could get it to work.

I'm currently copying my entire Poser 7 directory to try out the reinstallation idea as a last resort.