I have a SGShape added to a group - say 'Group A'. I have created a GaussianBlur and set 'Group A' as it's child. I have added the Effect node to another group - Say 'Group B' that constitutes the scene in the JSGPanel. Now on clicking the shape, I am adding the same shape directly to 'Group B' without explicitly removing it from 'Group A'.
When I do this, the shape turns completely black. This is noticed only when I have an Effect on 'Group A' and only when the shape is filled with RadialGradientPaint. Not reproducible when the shape is filled with a solid color.

I reproduced it on WinXP with 6u10-b11, using Scenario 0.5.

To reproduce the bug, run the attached test. You will see a rectangle filled with RGP. Click it. You will notice that the shape turns black completely. Click it again and it will be restored since it is added to the original parent on second click.