Which of these errors should I worry about (if any)?

[Chris Green]

My .xsession-errors file contains the follwoing:-

    Agent pid 9814
    which: no dbus-launch in (/home/chris/bin:/home/chris/bin:/home/chris/bin:/usr/l
    ocal/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/games:/opt/kde/bin:/opt/www/htdig/bin
    :/usr/lib/java/bin:/usr/lib/java/jre/bin:/opt/kde/bin:/usr/lib/qt/bin:/usr/share
    /texmf/bin:.:/usr/local/mysql/bin)
    Xlib:  extension "RANDR" missing on display "chris.home.isbd.net:0.0".
    Xlib:  extension "XFree86-VidModeExtension" missing on display "chris.home.isbd.  net:0.0".

    ** (xfce-mcs-manager:9820): CRITICAL **: file vc_oss.c: line 95 (find_master): assertion `mixer_handle != -1' failed

    ** (xfce-mcs-manager:9820): WARNING **: oss: No master volume

    (xfce-mcs-manager:9825): Gtk-WARNING **: Unable to locate theme engine in module _path: "metal",

    (xfce4-session:9817): Gtk-WARNING **: Unable to locate theme engine in module_pa th: "metal",

    (xfwm4:9828): Gtk-WARNING **: Unable to locate theme engine in module_path: "met al",

    (xfce4-panel:9831): Gtk-WARNING **: Unable to locate theme engine in module_path : "metal",

    ** (xfce4-panel:9831): CRITICAL **: file vc_oss.c: line 95 (find_master): assert ion `mixer_handle != -1' failed

    ** (xfce4-panel:9831): WARNING **: oss: No master volume

    (xftaskbar4:9836): Gtk-WARNING **: Unable to locate theme engine in module_path: "metal",
     
    (xfdesktop:9839): Gtk-WARNING **: Unable to locate theme engine in module_path: "metal",
    Xlib:  extension "XFree86-Misc" missing on display "chris.home.isbd.net:0.0".

I guess I may be able to fix the "Unable to locate theme engine"
errors myself but what about those Xlib ones and the 'CRITICAL' one
about vc_oss.c?

-- 
Chris Green (chris at areti.co.uk)

    "Never ascribe to malice that which can be explained by incompetence."