i've found a fix: edit /usr/share/gnome/applications/kde4/kmailservice.desktop and supply the full path to kmailservice (/usr/lib/kde4/libexec/kmailservice) to the exec command and it will work again. i don't know who creates this path/files but it works after adding the full path. perhaps reassing to gnome-session-common, perhaps this package owns this path. regards, msc