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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Is it possible that it's actually to do with wiring? Do you have GND properly connected between the controller and the MAX7219?
Or how long are the wires you're using? An 8x8 LED matrix at 5v can draw a lot of power, so with long, thin wires the voltage drop can be enough that you get communications issues.
You can easily change the baud rate if needed though: http://www.espruino.com/Reference#l_SPI_setup