There generally is no one "answer" to figuring out why a blinky won't reprogram. There are a bunch of things to try, and if troubleshooting doesn't work, we'll gladly send you a new kit.
RuntimeExpection, does your blinky work ok for displaying the pre-programmed messages? Do all of the LEDs light up for playback? When you enter into the programming mode, does the behavior of the blinky match what is displayed in our animated GIF of the programming process
? If not, where do things start to differ from the programming guide?