Just in case it might interest you, here's a new bug which appeared when I used argyll built against the distribution libusb (did not happen with custom libusb): in spotread, with the Rev. D Eye One Pro, instrument calibration always fails: Calibration failed with 'Communications failure' (Communications failure) Hit any key to retry, or Esc, ^C or Q to abort: Calibration failed with 'Internal software error' (Integration time is too small) Hit any key to retry, or Esc, ^C or Q to abort: The first error appears only once, the second until abort. Ludovico Fischer