Created:

public class BrowserApp extends Application
{
public static void main(String[] pArgs)
{
Launcher.launch(BrowserApp.class, pArgs);
}

@Override
public void start(Stage pStage)
{
BorderPane bpane = new BorderPane();

WebEngine webe = new WebEngine();
webe.setUrl("http://www.google.com");

WebView webv = new WebView(webe);

bpane.setCenter(webv);

pStage.setScene(new Scene(bpane));
pStage.setVisible(true);
}

}

Resized the Window vertical to max screen height and ~ 10px, repeated this action and got:

java.lang.IllegalArgumentException: fromIndex(0) > toIndex(-800)
at java.util.Arrays.rangeCheck(Arrays.java:1306)
at java.util.Arrays.fill(Arrays.java:2465)
at com.sun.openpisces.OpenPiscesRenderer.reset(OpenPiscesRenderer.java:392)
at com.sun.prism.impl.shape.OpenPiscesRasterizer.getRenderer(OpenPiscesRasterizer.java:26)
at com.sun.prism.impl.shape.OpenPiscesRasterizer.setupRenderer(OpenPiscesRasterizer.java:116)
at com.sun.prism.impl.shape.OpenPiscesRasterizer.getMaskData(OpenPiscesRasterizer.java:73)
at com.sun.prism.impl.shape.ShapeUtil.rasterizeShape(ShapeUtil.java:47)
at com.sun.prism.impl.ps.BaseShaderGraphics.fillShape(BaseShaderGraphics.java:241)
at com.sun.prism.impl.BaseGraphics.fill(BaseGraphics.java:267)
at com.sun.prism.impl.shape.BasicShapeRep.fill(BasicShapeRep.java:23)
at com.sun.webpane.sg.prism.WCGraphicsPrismContext.drawPolygon(WCGraphicsPrismContext.java:319)
at com.sun.webpane.platform.graphics.GraphicsDecoder.decode(GraphicsDecoder.java:111)
at com.sun.webpane.platform.graphics.WCRenderQueue.decode(WCRenderQueue.java:23)
at com.sun.webpane.platform.WebPage.paint2GC(WebPage.java:606)
at com.sun.webpane.platform.WebPage.paint(WebPage.java:585)
at com.sun.javafx.sg.prism.NGWebView.renderContent(NGWebView.java:83)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:95)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:36)
at com.sun.javafx.sg.BaseNode.render(BaseNode.java:904)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:142)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:352)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:95)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:36)
at com.sun.javafx.sg.BaseNode.render(BaseNode.java:904)
at com.sun.javafx.tk.glass.PrismPen$PaintRunnable.paintImpl(PrismPen.java:185)
at com.sun.javafx.tk.glass.PrismPen$PaintRunnable.run(PrismPen.java:290)
at com.sun.javafx.tk.glass.RunnableEvent.run(RunnableEvent.java:13)
at com.sun.javafx.tk.glass.GlassToolkitImpl.run(GlassToolkitImpl.java:124)
at java.lang.Thread.run(Thread.java:619)
Prism Render Thread uncaught: java.lang.IllegalArgumentException