Debugging a macro

I'm working on a new version of the multipart.sl macro for slrn and I'm
noticing that the macro is threading the subjects in an inconsistent
fashion.  In an attempt to debug it I've used slsh and loaded the macro.
I've then manually copied and pasted the subjects that aren't threading into
slsh and passed them to my function which behaves correctly.  But
naturally that isn't exactly what I am looking for.

Is there some way to debug this from slrn after loading the news group
which contains some unthreaded articles that I think should be threaded?

An added data point is that I have occasionally seen a message "Frame
Stack Overflow" when loading the news group however I think it
disappears quite quickly.  Is there some way to change this behavior and
is it likely related to my macro?

Thanks in advance,
-- 
Brian Murray

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