Newbie here 
At my whitts end with this now, get a whte scren on the 8x8 rainbow, used the Diecimila to program by removing the chip, programmed ok with Rainbow_mtX.pde and so now it shows a white screen, have changed com port to 1 and have unzipped the windows_mtX Control
it loads mxt control fine and when it loads the matrix goess black then back to white,
any help?
thankyou
any pone out there