[argyllcms] White point or black point adjustment not working

I am trying to adjust my display (Eizo L568 LCD), using Argyll 1.0.3 on a GretagMacbeth Pantone Huey (running on Ubuntu Jaunty 9.04).
When I try to set the white point or the black point (options 2 and 4 of the menu shown by dispcal -ly -v), the following happens: 
- measurements are done
- I am asked to adjust the R, G and B offsets
- without adjusting the monitor the instructions change every one or two seconds 

A line showing R+ G+ B-- changes into something like R-- G- B+
And this keeps going on, even if I do change the monitor settings, making the calibration device more or less useless. 

Can anyone explain what is happening, and better how it can be stopped?
Below is some output of dispcal.

Thanks,
George


Setting up the instrument
Place instrument on test window.
Hit Esc, ^C or Q to give up, any other key to continue:
Display type is LCD
Target white = native white point
Target white brightness = native brightness
Target black brightness = native brightness
Target advertised gamma = 2.400000

Display adjustment menu:
Press 1 .. 7
1) Black level (CRT: Offset/Brightness)
2) White point (Color temperature, R,G,B, Gain/Contrast)
3) White level (CRT: Gain/Contrast, LCD: Brightness/Backlight)
4) Black point (R,G,B, Offset/Brightness)
5) Check all
6) Measure and set ambient for viewing condition adjustment
7) Continue on to calibration
8) Exit
Doing some initial measurements
Red   = XYZ  13.55   7.72   0.38
Green = XYZ  10.85  23.88   4.11
Blue  = XYZ   5.23   2.73  29.41
Black = XYZ  -0.00   0.04   0.00
Grey  = XYZ   5.55   6.45   6.34
White = XYZ  29.51  34.26  33.78

Adjust R,G & B offsets to get target x,y. Press space when done.
  Target Br 0.34, x 0.3025, y 0.3512
/ Current Br 0.47, x 0.2950, y 0.3346  DE  8.1  R+  G+  B--

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