lts.conf settings being ignored

[Joseph Bishay]

Hello,

I hope you are all doing very well today.

Yesterday I was attempting to configure a printer attached to a thin
client, when it wasn't working.  I've done it many times so I know the
procedure.  I soon realized that my lts.conf is being processed but
ignored.

Nearly 6 hours later, and at least 4 hours on LTSP IRC with some kind
people, and there's no solution.  I lost most of my hair from
frustration so I'm hoping someone has a clue here.

The details:
- Edubuntu 12.04 LTS
- lts.conf is located in /var/lib/tftpboot/ltsp/amd64/lts.conf
- if I specify settings in both [default] and [mac address], all the
thin clients will hang upon reboot.  Specifically they'll PXE boot,
download the image from the server, load the screen that says edubuntu
with the dots under it, and then freeze.
- if I comment out the settings under [default] OR under [mac
address], the thin clients will load correctly but will ignore
whatever the settings are that are not commented out
- if I comment out everything, the thin clients will load correctly

Example lts.conf that will allow the thin clients to load correctly:
[default]
SOUND=false
SCREEN_07=shell
#[00:22:64:BB:60:A8]
#SCREEN_01=shell

That's all that's in the file.  The thin clients will load the GUI
correctly and will have full sound, even though it should have a shell
only and no sound!

If I uncomment the last 2 lines, the thin clients will hang upon boot.

Also spacing seems to play a role.  If I take the *exact* same working
lts.conf as above, but press enter between the two stanzas, it will
hang.

[default]
SOUND=false
SCREEN_07=shell
<I press enter here>
#[00:22:64:BB:60:A8]
#SCREEN_01=shell

This is driving me nuts.  Any suggestions?

Thank you
Joseph