Is this a known issue? how can I help providing more info.
I happens not often but randomly. cu $ apt-cache policy kwin kwin: Installed: 4:3.5-rc1-1 Candidate: 4:3.5-rc1-1 Version table: *** 4:3.5-rc1-1 0 500 http://pkg-kde.alioth.debian.org ./ Packages 100 /var/lib/dpkg/status 4:3.4.3-2 0 1 http://ftp.rediris.es ../project/experimental/main Packages 4:3.4.2-4 0 500 http://ftp.es.debian.org sid/main Packages 500 http://ftp.rediris.es sid/main Packages