Comment 7 for bug 1249618

Confirmed. fc17 linux 32bit.

Here are some notes from what I posted on IRC about reproducing this:

In the color chooser from the "Fill and Stroke" dialog, if Luminance (L) in the HSL chooser is set to 0 or 255, the Hue and Saturation choosers cannot be set by clicking, as they just jump back to 0, using the spinner makes them move, but clicking again makes them jump back. Setting the Luminance to any other value allows the S or L values to be changed now.

Note, this behavior is destructive, as noted, since if you mistakenly set the L to any extreme value it will kill the values you had for S or H.

I agree with suv, its likely related to Bug #1462907 as well.