It's a strange problem. It's the first report that I have about it and I know some people who are using wordpy with blogger without problems. I have tested it to a great extent, but there can be some bug has escaped.

Could you run wordpy from the Terminal application?
Run the Terminal app, write "MaemoWordPy" without the "", and try to publish something. There will have to be some error shown in the terminal app, please write it here.