Hello Chris,
CK> How do you start Tracing Messages Browser? CK> I have it installed in a 3.9 image but can't figure out how to run it.
it just changes the function of senders / implementors in the normal Browser. In some time I had a problem by using the buttons in the Browser, I had to use Alt m after selecting a method. There was a fix from Marcus Denker which corrected this in RB.
If you are in the TMB the senders.. buttons work as expected. If you select a method with may senders you can drag over the unwanted ones in the top pane, shift right click and select "remove from this Browser".