Version:           1.9.9 (using 3.5.9, Kubuntu (hardy) 4:3.5.9-0ubuntu7.1)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.24-18-generic

My filters are very simple and most with the whole email address or the content of part of these (i.e. @global-webservice.net). I have the filters in their own directories that redirect the mails to directories in the main windwow in KMail. First, all mail that was not re-directed by the filter went no more to the "Inbox", instead to a created box "Listas" and all worked wrong. The filters worked fine with Kubuntu 7.10 and the failure appeared suddenly (I perform all automated actualizations of the system). With my actual Kubuntu 8.04 the failure remains.