Ultimate Boot CD

Hi I cannot make UBCD to work with YUMI (pendrive multiboot tool, http://www.pendrivelinux.com/yumi-multiboot-usb-creator/ ). When booting UBCD, it jumps just to GRUB command line (I think it is that). I use latest versions of both. I can boot Ubuntu and Hiren BootCD with no problems. Please help. I...