Well, I seem to have found my problem. The threading was working just fine, the real problem is that the logging module doesn't want to play nice and wasn't outputting any of the debug notifications..

I'm working on fixing a formatting problem in a bunch of XML files. I've got the find/replace all done, but there are so many files that I want to do the substitutions in a few separate threads to speed up the whole process. I've tried implementing the methods used in a few different threading tutorials and I've run into a wall. No errors, but it's definitely not working. Here's what I have right now: www.pastebin.co m/QhrvhmzN