In Ensemble Controls sample, the ListViewCellFactory app has hard coded color BLACK for Zero values.
This causes black colored list items not visible if Ensemble sample is launched with dark colored background theme.

See the attached screenshots illustrating the problem.

To launch the Ensemble App in dark colored background theme use any one of the following options-
1) -Dcom.sun.javafx.highContrastTheme=yellowOnBlack
2) -Dcom.sun.javafx.highContrastTheme=whiteOnBlack