This is reproducible with soma integration b18 with prism enabled. This is seen on mac 10.5. This works alright with swing toolkit.

Run the below program. It creates a stage with visible set to false. This throws an exception on console:

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.javafx.runtime.provider.GUIRuntimeProvider.run(GUIRuntimeProvider.java:62)
at com.sun.javafx.runtime.Entry.start(Entry.java:84)
at com.sun.javafx.runtime.Main.main(Main.java:80)
Caused by: javax.media.opengl.GLException: OpenGL context not current
at com.sun.opengl.impl.macosx.cgl.MacOSXCGLContext.setSwapInterval(MacOSXCGLContext.java:342)
at com.sun.opengl.impl.gl2.GL2Impl.setSwapInterval(GL2Impl.java:22245)
at com.sun.prism.es2.ES2Context.updateRenderTarget(ES2Context.java:60)
at com.sun.prism.impl.ps.BaseContext.setRenderTarget(BaseContext.java:347)
at com.sun.prism.impl.ps.BaseContext.setRenderTarget(BaseContext.java:341)
at com.sun.prism.impl.ps.BaseGraphics.<init>(BaseGraphics.java:56)
at com.sun.prism.es2.ES2Graphics.<init>(ES2Graphics.java:16)
at com.sun.prism.es2.ES2Graphics.create(ES2Graphics.java:25)
at com.sun.prism.es2.ES2SwapChain.createGraphics(ES2SwapChain.java:29)
at com.sun.prism.es2.ES2Window.getGraphics(ES2Window.java:52)
at com.sun.javafx.tk.prism.PrismScene$1.run(PrismScene.java:209)
at com.sun.prism.tk.RunnableEvent.run(RunnableEvent.java:47)
at com.sun.prism.tk.PrismToolkitImpl.processRenderEvent(PrismToolkitImpl.java:155)
at com.sun.prism.tk.PrismToolkitImpl.processRenderTasks(PrismToolkitImpl.java:171)
at com.sun.prism.tk.PrismToolkitImpl.run(PrismToolkitImpl.java:107)
at com.sun.javafx.tk.prism.PrismToolkit.startup(PrismToolkit.fx:118)
... 7 more


Testcase:
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.shape.*;
import javafx.scene.paint.*;
import javafx.scene.input.*;

Stage {
    visible: false
    width: 400
    height: 400
    x: 10
    y: 10
    scene: Scene {
        fill: Color.RED
        content: Rectangle {
            x: 40
            y: 40
            width: 50
            height: 50
            stroke: Color.BLACK
            strokeWidth: 4
            fill: Color.BLUE
        }
    }
}