Hi Paul,

This is expected behaviour as far as I know.
The viewer camera won't return you a viewport if more than one device context is used (i.e. more than monitor)

Ok now I am making some progress. If I set the environment variable OSG_SCREEN 
to 1 then the problem goes away and the pointer returns valid. Evidently this 
is related to another problem that I've been having ... I have dual monitors 
and OSG apps open up spanning both monitors with the left monitor functioning 
properly and the right monitor remaining a static frame.

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=41977#41977





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