I'm using a normal with a bump map, wrapped around a sphere using
warp{spherical}.  It looks normal in the northern hemisphere, but the bumps are
changed to depressions in the southern.
I've reproduced this on 3.8.0 alpha on Linux, as well as both 3.7 and 3.8 beta
on Macintosh.  Attached is a scene file that reproduces it (bumpmap.pov), along
with the two
bump map images it uses and the resulting image.  The "equator" on the image is
3 rows from the top, so you can see the top 3 rows are correct and the ones
below that are inverted.  (Light is above the camera.)
--paul

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