With the following SDK build:

    [echo] Current SDK: Product: javafx-2.0beta
    [echo] Platform: macosx-universal
    [echo] Build-Number: 168
    [echo] Build-ID: 2011-05-26_20-33-28
    [echo] Latest SDK: Product: javafx-2.0beta
    [echo] Platform: macosx-universal
    [echo] Build-Number: 171
    [echo] Build-ID: 2011-05-31_19-32-58

I get the following assertion crash each time I exit from VisualTool:

2011-06-01 12:09:33.477 java[52328:aa03] *** Assertion failure in -[GlassView3D lockFocus], /SourceCache/AppKit/AppKit-1038.35/AppKit.subproj/NSView.m:5237
2011-06-01 12:09:33.478 java[52328:aa03] lockFocus caught exception: -[GlassView3D(0x102021460) lockFocus] failed with window=0x1020201f0, windowNumber=6791, [self isHiddenOrHasHiddenAncestor]=0
Assertion failed: ([NSOpenGLContext currentContext] == [self openGLContext]), function -[GlassView3D begin], file /HUDSON/workspace/presidio/label/macosx-universal-14/glass/glass-mat-lib-macosx/src/com/sun/mat/ui/GlassView3D.m, line 393.
Java Result: 134