The paintValue set to false in the synth look and feel xml, is applied to the slider which is in an enabled state also.
Steps to reproduce:
1)Extract the zip file attached.
2)Execute the SynthSliderTest with the b32 . It has two sliders one enabled and one disabled.
3)Notice that the Slider.paintValue is defined as false for the disabled state of the slider in synth LAF xml file.
4)However the value of the slider is not visible for both the sliders- even for the slider which is enabled.
5) Now goto the xml file and add the following lines after </state> under the style id='slider'.

<property key=Slider.paintValue type="Boolean" value="false"/>
  <state value="ENABLED">
        <painter idref="MyPainter" method="sliderBackground"/>
<property key="Slider.paintValue" type="Boolean" value="true" />
    </state>
6)Execute the SynthSliderTest again with the b32.
7) Note that now the slider value appears for both the enabled and disabled states.