Unchecking the "Remove chromatic aberration" after it had been checked and adjusted does not work in the sense that the removal remains active.
How could you adjust "Remove chromatic aberration" if it only have one checkbox and is completely automatic?
You probably have adjusted "Defringe" sliders, they are not related to "Remove chromatic aberration" checkbox.
To disable it you have to set two amount sliders to zero.
That one fooled me too the first time. Chromatic aberration is the automatic removal of red/cyan aberration normally found in wide angle lenses. Defringing does axial CA and purple blooming and any remaining CA that the check box didn't pick up.
Just to be clear, there are two independent sets of controls here.
You can turn off automatic (radial) chromatic aberration, and it works. Or it does on my LR4.1 RC2, I've just tried it. That's the only control for radial chromatic aberration: on or off.
However, as far as I'm aware, the "Defringe" sliders (for axial "purple fringe" chromatic aberration) are not affected by the Chromatic Aberration check box. You adjust the sliders as the others have said.