Mac Lion window flickering and NPE in upload pixels

Currently I'm using the JavaFX 2.1 GA Build with Mac OS X Lion (10.7.3) on my MacBook Pro (2.33 GHz Intel Core 2 Duo, 4GB 667 MHz DDR2 SDRAM, ATI Radeon X1600 256 MB) an run into some performance and ui problems. The overall rendering framerate is arround ~30fps (which is normally 60fps on my desktop computer) and if I try to resize the main window the window starts to flicker and I get the following exception:

Glass detected outstanding Java exception at -[GlassRunnable run]:src/com/sun/mat/ui/GlassApplication.m:163
Exception in thread "AWT-AppKit" java.lang.NullPointerException
 at com.sun.glass.ui.mac.MacView._uploadPixels(MacView.java:72)
 at com.sun.glass.ui.View.uploadPixels(View.java:706)
 at com.sun.prism.j2d.J2DPresentable$Glass$1.run(J2DPresentable.java:99)