"disappearing" mail and nnmail-split-fancy

[marco]

last week i renamed a bunch of my nnml+private groups and now
messages which should end in particular groups are being dropped
(they are downloaded, and are available in ~/Mail/Incoming<whatever>,
but don't show up in the groups buffer). this only applys to cretian
rules in my nnmail-split-fancy so i'm thiking there's something weird
about the groups i renamed. 

does anybody know what this could be? is there a way i can ask gnus
to teel me what it's doing with each message it downloads?

-- 
-Marco
Ring the bells that still can ring.
Forget your perfect offering.
There is a crack in everything.
That's how the light gets in.
     -Leonard Cohen