Color Mixer is broken

I do not see how to adjust the numbers instead of the slider. The top

slider in the panel sometimes allows me to type a number, but none of

the others do.  They do not even give a blue line to type on.

I tested it by making a copy of my photo

Pulled down Color in the color mixer area.

selected magenta

tried to run the slider

no movement to the slider.

However, if I click on the hue or saturation line, my photo changes, but

does NOT give a number nor does the slider move.

if I "reset" the slider by clicking on its name, it may or may not

change back.

Clicking on the line to advance in that one channel, may result in odd

colors, like blue in the red channel.

Keep in mind that all this was working well up to a certain point.  No

problems at all.

I will try to give you any other information you need.

Thank you for your help.

P. Germond