spam filtering with spamassassin and kmail

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I'm doing something wrong and I don't know what it is.

I set up the spam filter on Kontact 1.1 using the anti-spam wizard and
I have been happily marking spam and ham ever since.  I've now
processed a couple of thousand messages.  The spam filter IS set to
"Classify messages using the anti-spam tools'.

The problem: every message that comes through, including messages I've
manually marked as spam or ham, is given a -6% of being spam by
spamassassin.  

I'm fairly certain that the major malfunction is occurring between
keyboard and chair; but darned if I can't figure out what's going on.
Any help?

Adam Plourde

P.S. If it is important, I am running SuSE 9.2, Kontact 1.1, KDE 3.4.0
level "b", spamassassin 3.0.0, all installed via YAST from the SuSE
repositories.
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