Have I mentioned I'm a dumbass recently?

The reasons both of these were failing is because my test scripts were named xml.py and wx.py, and they were both in ~, where I was running Python from more often than not. So Python was trying to import those instead of the correct modules. It was behaving correctly. (I was to the point where I was machine-translating messages from the Chinese Python mailing list before this occurred to me.)

So it turned out to be a ID-10-T error the whole time. Sorry for starting a thread about this.... Gyaah.