Hi I'm not sure if this is a python-mode or a pdbtrack issue (or how the two fit together), so if's pdbtrack could you please forward it to the pdbtrack author.
The problem is that interactive debugging stops working on subclasses. In the example below, there's a big in Cat.hello but tracking is lost. It's important because many people rely on the ability to step through subclass code and to edit the code instantly on error lines -- my debuigging time takes about 10 times as long without this ability!
from Animal import *