Well, the script ran okay (in Poser Pro 2010) for a scene with just props and the default Figure1, changing every material it found to the same as the one I had selected in the Material Room. I'm afraid I have no idea why it won't update your material zones, Mr Butterfly. Do you see a similar list to this when you run the script?

Anyway, I then added a figure (Miki2_Dev), selected my test prop material, and ran the script again. It took ages, and when it eventually finished, the output window explained why: for each one of Miki2's actors, it updated all of her material zones.

The only reason for this that I can think of is that material zones are assigned directly to the figure, rather than to its actors. A minor change to the script should resolve this issue.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)