I think it has to do with the proportions (w x h) of the 3d window somehow.
Found out about this the same way as you did, rendering on multiple workstations, with different work environments set up.
There are many quirks with perspective behaviour, especially if you also use Two-Point Perspective, where it takes some turning it on / switching off etc until you've matched your view again.
We render out several different renders (colour, ambient occlusion, sketch contours, sketch vectorial hatches, sometimes depth map), so you learn to deal with them eventually and don't really think about it anymore.
It is certainly possible to easily render out the same perspective many times.
I've tested a marquee render and a full render and I can overlay them pixel perfect, but I am seeing some issues from global illumination artifacts not being the same between the two.
Erwin Edel, Project Lead, Leloup Architectenwww.leloup.nl
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