Child Theme not taking precedence

Not sure what I'm doing wrong, but I have a child theme template that isn't taking precedence over the parent theme... buddy fun.

1. I have deactivated the parent theme in the MU admin panel
2. Activated the child theme
3. Copied the file over, and the file structure matches
4. Made the edits and .... nothing.

I did see something about TEMPLATEPATH, but I wasn't 100% clear on how to use that solution.

Thanks!