Hi Jaak, 900913 uses the "null" gridshift to convert ellipsoids (WGS84 <> Sphere) without doing proper calculations (ie. just plain ignoring that WGS84 isn't a sphere).
Where did your proj build come from? There was a problem with the Debian/Ubuntu packaging a while back where the grid-shift files were marked as being applicable to both 32 & 64 bit, when they're not. So if you weren't on the architecture which it was built on, weird gridshift-errors would come about. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=530818 Rob :)
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