I've never had a problem before this. Half of the leaves are turning color. They are not mushy. I've taken a leaf cutting in case it dies. Will this spread to my other violets? What the heck is this? Help!
Old leaves? Young leaves? How long ago did you repot it?
Can you make a pic?
If it is one and only one plant - you are doing the right thing - root the leaf and dispose of the old plant. Most possibly something wrong with the conditions - too cold, too much fertilizer in a soil, Ph gone out of the desirable range etc. And this plant is just the most sensitive.
You can leach it, repot it in a fresh soil and baby it a bit, but usually it takes forever to grow out of the damaged look.
If you post the pics - I am sure somebody will come up with a better diagnosis.