Hi, since you are using testing, do you have a mixed Plasma ? Plasma in testing is broken at the moment as not all packages have migrated from unstable to testing yet. Which version of libkdecorations2-5v5 do you have installed? 5.21.5 or 5.23.0 ? If it's 5.21.5, a possible workaround is decsribed at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996726 -- Med vänliga hälsningar Patrick Franz