Missordered panels

I am coming to a point where I notice panels getting miss-ordered when 
rendering.

My file is, I suppose, possibily larger than most (45 M file, 140000 
elements, 5400 emitters)
and quite complex, but even if I make a sub-file with only a small part of 
the objects, less
than 700 K file, I still have the problem of some panels that should be 
hidden jumping ahead of
others that are just in front of them.  This behavior cannot be seen on the 
3D views, and only
becomes apparent while rendering.  Owing to the complexity of my scene, 
rendering takes
about an hour, so it is quite unsettling when the final result comes out 
marred by such details.

I presume that there must be some rounding off errors, as a small rotation 
of the object,
or moving it somewhere else, will displace the problem (some hidden panels 
that were
erroneously shown will disappear, but other will appear that should not be 
seen).

Is there something that can be done, short of moving everything so close to 
the camera
so that I loose all the perspective that makes my scene good?


CBVG



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