Spam getting scored but not tagged

["Chris St. Pierre" <st...@NebrWesleyan.edu>]

I've started getting spam sneaking through SpamAssassin with no
tagging.  When I look in the logs, I can see that it gets scored, but
the headers I've asked SA to add are simply not added.

Aug 15 01:39:18 mirni spamd[20138]: spamd: processing message <BA...@phx.gbl> for spamd:403
Aug 15 01:39:20 mirni spamd[20146]: spamd: identified spam (31.4/5.0) for spamd:403 in 1.7 seconds, 1373 bytes.
Aug 15 01:39:20 mirni spamd[20146]: spamd: result: Y 31 - FRT_LEVITRA,KAM_VIAGRA6,SUBJECT_DRUG_GAP_L,SUBJ_BUY,URIBL_BLACK,URIBL_JP_SURBL scantime=1.7,size=1373,user=spamd,uid=403,required_score=5.0,rhost=localhost.localdomain,raddr=127.0.0.1,rport=35915,mid=<BA...@phx.gbl>,autolearn=spam
Aug 15 01:39:20 mirni spamd[20146]: spamd: accidental fork: 20146 != 20138 at /usr/bin/spamd line 1628.

I've got the following in my local.cf:

clear_headers
add_header spam Flag _YESNOCAPS_
add_header all Level _STARS(*)_
add_header all Status _YESNO_, bayes=_BAYES_ score=_SCORE_ required=_REQD_ tests=_TESTSSCORES(,)_ autolearn=_AUTOLERRN_ version=_VERSION_
rewrite_header Subject [SPAM:_STARS(*)_]

What's going on here that prevents the tagging from happening?  Thanks!

Chris St. Pierre
Unix Systems Administrator
Nebraska Wesleyan University