I cannot reproduce this with the separate application.

So.
hg clone http://shaman.russia.sun.com/hg/index.cgi/java-client/

In java-client folder create build.properties file with the content like this:
javafx.home=C\:/Program Files/Java/jdk1.7.0_06/jre

Run: javafx.scene.control.test.RichTextEditorApp.

Part of output:
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.list-view' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:vertical' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:vertical *.track-background' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar *.increment-button' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-mark-highlight-color' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:vertical *.increment-arrow' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar *.decrement-button' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-mark-highlight-color' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:vertical *.decrement-arrow' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:vertical *.track' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:vertical *.thumb' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:horizontal' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:horizontal *.track-background' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-box-border' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar *.increment-button' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss
WARNING: com.sun.javafx.css.StyleHelper calculateValue Could not resolve '-fx-mark-highlight-color' while resolving lookups for '-fx-background-color' from rule '*.scroll-bar:horizontal *.increment-arrow' in stylesheet jar:file:/C:/Program%20Files/Java/jdk1.7.0_06/jre/lib/jfxrt.jar!/com/sun/javafx/scene/control/skin/caspian/caspian.bss

Reproducible on different windows machines. And it is not reproducible on any other application from java-client.