[TxMt] TODO bundle does not turn up TODO items in my Ruby project

I have a Ruby code project with several TODO comments in it. When I run the TODO list command, the bundle displays an empty list. If I open one of the Ruby source files in the project by itself, the TODO bundle does list to TODO items it contains. Presumably the Bundle doesn't like the way I have my project set up. I have *.rb source files in the standard Ruby gem directory structure (i.e. in lib, test, bin subdirectories). I manually add all files to the project (i.e. I don't have Textmate automatically import them.) I have created lib, test, and bin groups in the project. I have tried highlighting various collections of items in the sidebar when running the show TODO list command to no avail.

Any suggestions as to what is wrong?