Yo he echo alguna modificacion que otra a los archivos de configuracion, ninugna carpeta de las distros tiene espacios en blanco.
./multiboot/syslinux.cfg
# Menu Entry Created by Lance xxxx for YUMI - (Your USB Multiboot Installer)
UI menu.c32
PROMPT 0
TIMEOUT 300
MENU TITLE System Tools
MENU BACKGROUND yumi.png
MENU WIDTH 72
MENU MARGIN 10
MENU VSHIFT 3
MENU HSHIFT 6
MENU ROWS 15
MENU TABMSGROW 20
MENU TIMEOUTROW 22
menu color title 1;36;44 #66A0FF #00000000 none
menu color hotsel 30;47 #C00000 #DDDDDDDD
menu color sel 30;47 #000000 #FFFFFFFF
menu color border 30;44 #D00000 #00000000 std
menu color scrollbar 30;44 #DDDDDDDD #00000000 none
#start wifislax-4.8-rc2
LABEL wifislax-4.8-rc2
MENU LABEL wifislax-4.8-rc2 (default)
CONFIG /multiboot/wifislax-4.8-rc2/boot/isolinux/isolinux.cfg
APPEND /multiboot/wifislax-4.8-rc2/boot/isolinux
MENU DEFAULT
#end wifislax-4.8-rc2
#start wifislax-4-7-2-final
LABEL wifislax-4-7-2-final
MENU LABEL wifislax-4-7-2-final
CONFIG /multiboot/wifislax-4-7-2-final/boot/isolinux/isolinux.cfg
APPEND /multiboot/wifislax-4-7-2-final/boot/isolinux
#end wifislax-4-7-2-final
LABEL Boot from first Hard Drive
MENU LABEL Continue to Boot from ^First HD
KERNEL chain.c32
APPEND hd1
Salu2