I found the problem.  I had a reference pointer to my camera which prevented 
the camera from getting deleted by the removeSlave function.  I didn't want to 
delete the camera, so I just did 
Code:
cameraHUD->setViewport(NULL);

 which worked.  Then I could set the viewport again when I wanted the HUD to 
reappear.

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http://forum.openscenegraph.org/viewtopic.php?p=32367#32367





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