try to create and put a file called "45Xsession" in /etc/X11/Xsession.d/ directory
and inside that file you put
==================================
#!/bin/bash

# this is your background..
fbsetbg -f ~/.fluxbox/backgrounds/smile_joker.jpg

# you can also put all the personalized setting commands here.
==================================

note, in that file, if you call a program, let's say firefox

"/usr/bin/firefox" and "/usr/bin/firefox &"

makes the different!! have a try.


-------------------------

cd can't boot can be a lot of reasons, can you try run a md5 check sum on your burnt CD?
try to double check with that before you boot your CDs.

------------------------

the command you used...
Code:
mkisofs -pad -l -r -J -v -V "KNOPPIX" -no-emul-boot -boot-load-size 4 \
   -boot-info-table -b boot/isolinux/isolinux.bin -c boot/isolinux/boot.cat \
   -hide-rr-moved -o /media/sda7/knx/knoppix.iso /media/sda7/knx/master
mmm......... it seems ok.
but this is what i usually do.
Code:
cd /media/sda7/knx/master
mkisofs -pad -l -r -J -v -V "KNOPPIX" -no-emul-boot -boot-load-size 4 \
   -boot-info-table -b boot/isolinux/isolinux.bin -c boot/isolinux/boot.cat \
   -hide-rr-moved -o /media/sda7/knx/knoppix.iso .
and yes there is a dot at the end of this command.

for more info see.
http://www.knoppix.net/wiki/Knoppix_...mpressed_Image

Winson