The following warnings thrown in sdterr when running Xfce 4.6, or when xfdesktop is being used to manage the desktop with JWM managing windows. (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/backdrop/screen0/monitor0/brightness" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/backdrop/screen0/monitor0/saturation" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/backdrop/screen0/monitor0/image-style" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/backdrop/screen0/monitor0/color-style" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/backdrop/screen0/monitor0/color1" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/backdrop/screen0/monitor0/color2" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/desktop-menu/show" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/windowlist-menu/show-sticky-once" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/windowlist-menu/show-submenus" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/desktop-icons/style" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/desktop-icons/icon-size" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/desktop-icons/font-size" does not exist on channel "xfce4-desktop" (xfdesktop-settings:PID): xfconf-WARNING **: Error check failed at xfconf_channel_get_internal():390: Property "/desktop-icons/use-custom-font-size" does not exist on channel "xfce4-desktop"
Don't compile with --enable-checks if you don't want to see these.
This is with xconf compiled with --disable-checks. Rebuilt it twice just to be sure, issue persists.
Removed the --enable/disable-checks option for the configure script, issue appears to be resolved.