Well, all I can say is; the Universe works in weird ways - not sure about the wonderful part.
Anyhow, I am just in the process of "writing" an article on how this threading actually works. It's a bit counterintuitive, but threading will produce just the results you are seeing. I am attaching a beat of the article. The issue was actually investigated by someone with more gray mater than me. And he penned his results in this article. All I'm going to do is rewrite is so it's nice looking and then publish it.
Download the attachment. Unzip it, rename the unzipped file to *.DOC and have a read.
- Ludek