Hi TraceE,
maybe the SliTaz Login Manager configuration file (/etc/slim.conf) has been changed though this trouble. This is my original file for the default user tux, maybe Your default user has changed:
# /etc/slim.conf: Slim login manger configuration file
#
# Path, X server and arguments (if needed)
# Note: -xauth $authfile is automatically appended
default_path ./:/bin:/usr/bin:/usr/local/bin
default_xserver /usr/bin/Xorg
#xserver_arguments
# Commands for halt, login, etc.
halt_cmd /sbin/poweroff
reboot_cmd /sbin/reboot
console_cmd /usr/bin/xterm -C -fg white -bg black +sb -T "Console login" -e /bin/sh -l -c "exec /bin/login"
#suspend_cmd /usr/sbin/suspend
# Full path to the xauth binary
xauth_path /usr/bin/xauth
# Xauth file for server
authfile /var/run/slim.auth
# Activate numlock when slim starts. Valid values: on|off
# numlock on
# Hide the mouse cursor (note: does not work with some WMs).
# Valid values: true|false
hidecursor true
# This command is executed after a succesful login.
# you can place the %session and %theme variables
# to handle launching of specific commands in .xinitrc
# depending of chosen session and slim theme
login_cmd exec /bin/sh -l ~/.xinitrc %session
# Commands executed when starting and exiting a session.
# They can be used for registering a X11 session with
# sessreg. You can use the %user variable
#
# sessionstart_cmd some command
# sessionstop_cmd some command
# Start in daemon mode. Valid values: yes | no
# Note that this can overridden by the command line
# option "-d"
#daemon yes
# Available sessions (first one is the default).
# The current chosen session name is replaced in the login_cmd
# above, so your login command can handle different sessions.
# see the xinitrc.sample file shipped with slim sources
sessions openbox,e17,jwm
# Executed when pressing F11 (requires imagemagick)
#screenshot_cmd mtpaint -s /root/slim-shot.png
# welcome message. Available variables: %host, %domain
welcome_msg Welcome to %host
# shutdown / reboot messages
shutdown_msg The system is going down...
reboot_msg The system is rebooting...
# default user, leave blank or remove this line
# for avoid pre-loading the username.
default_user tux
# current theme, use comma separated list to specify a set to
# randomly choose from
current_theme slitaz
# Lock file
lockfile /var/lock/slim.lock
# Log file
logfile /var/log/slim.log
# Let normal users have access to systems commands. If the value is true,
# then the root password is requiered to start a system command.
# Valid values: true|false
# root_password false
I hope, that this helps or that somebody else gives You a good advice or that You find a solution by Yourself. Sorry I don't know how to help You in a better way, especially I have no experience in removing or creating users in SliTaz.