Test api/javax_swing/interactive/JSliderTests.html#JSlider [JSliderTest0010] fails with error "There is no influence of checkbox's state on track visibility" when MotifLookAndFeel is used.
The JSlider.setPaintTrack() method appears to have no effect on visibility of the slider's track.
The failing test exists in JCK 8 and JCK 8a.
This failure is seen on JDK 8 and 8u26.

Configuration
jck8a b12 vs jdk8u26 b20
Additional option
-Dswing.defaultlaf=com.sun.java.swing.plaf.motif.MotifLookAndFeel
Test reports
Linux: http://moonblade.ru.oracle.com/set/java/jck/qa-results/jck/8a/atr/interactive/linux/api-motif-linux/report/html/kfl_newfailures.html
Solaris: http://moonblade.ru.oracle.com/set/java/jck/qa-results/jck/8a/atr/interactive/solaris/api-motif-sol/report/html/kfl_newfailures.html
MacOS X: http://moonblade.ru.oracle.com/set/java/jck/qa-results/jck/8a/atr/interactive/macos/api-motif-macos/report/html/kfl_newfailures.html

Failure is demonstrated in attached images.