Working on Ubuntu 9.10, NVidia GeForce 9800 GPU, Blender 2.52.5 r28338

In the colour balance node, when using the HSV colour picker, the maximum HSV "Value" is 1, rather than 2. When a brighter value is picked with the slider above and one of the hue/saturation sliders is then moved, the value jumps back to 1, requiring the value to be re-adjusted. See attached blendfile.