Probably a dup, but in b42 if you simply click inside of a TextArea, it throws the following exception:

java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.get(Unknown Source)
at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:141)
at com.sun.javafx.scene.control.skin.TextAreaSkin$ContentView.layoutChildren(TextAreaSkin.java:182)
at javafx.scene.Parent.layout(Parent.java:886)
at javafx.scene.Parent.layout(Parent.java:896)
at javafx.scene.Scene.layoutDirtyRoots(Scene.java:428)
at javafx.scene.Scene.doLayoutPass(Scene.java:401)
at javafx.scene.Scene.access$2800(Scene.java:126)
at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:1719)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:283)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:398)
at com.sun.javafx.tk.quantum.QuantumToolkit$10.run(QuantumToolkit.java:330)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$2$1.run(WinApplication.java:62)
at java.lang.Thread.run(Unknown Source)