hi, The man page still shows / etc/xdg/xfce4-session/xfce4-session.rc as configuration file. I searched in vain for hours, in packages and on the internet. Finally it's on a forum I found the correct configuration file: / etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-session.xml
Thank you for reporting this, I just fixed this in git master and 4.8 branches. The fix will be available in the next stable release.