Gradients don't translate correctly w/ JDK6u12

The code below demonstrates a bug with translation of gradient paints. The pattern on the box should remain constant, but instead it "moves off" as the box moves across the screen. (The animation in the test case was written to accentuate this).

I first thought this was a driver issue w/ my video card (7600 GT, notorious for having problems w/ many things), but I also reproduced this on a Radeon X600. It worked okay on the X600 up until I updated my JDK to 6u12.

This is reproducible with JavaFX 1.1, as well as with marina/scrum/graphics #112.
----
import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.scene.paint.Color;
import javafx.scene.paint.LinearGradient;
import javafx.scene.paint.Stop;
import javafx.scene.Scene;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

/**
 * @author bchristi
 */

var rect: Rectangle = Rectangle {
    width: 100
    height: 100
    fill: LinearGradient {
        stops: [
            Stop {
                offset: 0.1,
                color: Color.TOMATO
            },
            Stop {
                offset: 0.5,
                color: Color.ROYALBLUE
            },
            Stop {
                offset: 0.9,
                color: Color.MISTYROSE
            }
        ]
    }
}

var stage = Stage {
    width: 640
    height: 480
    scene: Scene {
        content: rect
    }
}

var tl = Timeline {
    repeatCount: 9999
    autoReverse: true
    keyFrames: [
        KeyFrame {
            time: 3s
            values: [
                rect.translateX => 100 tween Interpolator.EASEIN
            ]
        },
        KeyFrame {
            time: 4s
            values: [
                rect.translateX => 540 tween Interpolator.EASEOUT
            ]
        }

    ]
}

tl.playFromStart();