Why do I get this message when I use a perspective camera with a matrix 
transformation ,e.g.:

camera {
         perspective
         right x * 4.0
         up y * 3.0
         matrix <0.9358968469314277, 1.862645149230957E-9, 
-0.3522741496562958, 0.05264317989349365, 0.988771082367748, 
0.1398586481809616, 0.348318487405777, -0.14943809807300568, 
0.9253877382725477, -68.93845592397729, 101.72871539795597, 
-174.07854648367464>
         angle 38.58009
}

?

The matrix just contains a rotation and a translation, so the vectors 
are perpendicular and the warning message is obviously wrong.

Is there any workaround other than turning off vista buffers?

Thanks
-sascha

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