gdal change between 1.7.3 and 1.8.1

Trying to see when things go wrong.  1.9.0 was built with a different proj4.

===== The original dem gives the same results for all =======

grep "Upper Left" P090_37122DSQ_BIG.dem.info.1.{6.3,7.3}
P090_37122DSQ_BIG.dem.info.1.6.3:Upper Left  (-122.5479167,  38.1937500)
P090_37122DSQ_BIG.dem.info.1.7.3:Upper Left  (-122.5479167,  38.1937500) (122d32'52.50"W, 38d11'37.50"N)

grep "Upper Left" P090_37122DSQ_BIG.dem.info.1.{7.3,8.1}
P090_37122DSQ_BIG.dem.info.1.7.3:Upper Left  (-122.5479167,  38.1937500) (122d32'52.50"W, 38d11'37.50"N)
P090_37122DSQ_BIG.dem.info.1.8.1:Upper Left  (-122.5479167,  38.1937500) (122d32'52.50"W, 38d11'37.50"N)

grep "Upper Left" P090_37122DSQ_BIG.dem.info.1.{8.1,9.0}
P090_37122DSQ_BIG.dem.info.1.8.1:Upper Left  (-122.5479167,  38.1937500) (122d32'52.50"W, 38d11'37.50"N)
P090_37122DSQ_BIG.dem.info.1.9.0:Upper Left  (-122.5479167,  38.1937500) (122d32'52.50"W, 38d11'37.50"N)

======= tif generated by gdal_translate 1.6.3 ======

I think this says that the change occurs between gdal 1.7.3 and gdal 1.8.1

grep "Upper Left" P090_37122DSQ_BIG.tif.info.1.{6.3,7.3}
P090_37122DSQ_BIG.tif.info.1.6.3:Upper Left  (-122.5479167,  38.1937500)
P090_37122DSQ_BIG.tif.info.1.7.3:Upper Left  (-122.5479167,  38.1937500) (122d32'52.50"W, 38d11'37.50"N)

grep "Upper Left" P090_37122DSQ_BIG.tif.info.1.{7.3,8.1}
P090_37122DSQ_BIG.tif.info.1.7.3:Upper Left  (-122.5479167,  38.1937500) (122d32'52.50"W, 38d11'37.50"N)
P090_37122DSQ_BIG.tif.info.1.8.1:Upper Left  (-122.5483333,  38.1941667) (122d32'54.00"W, 38d11'39.00"N)

grep "Upper Left" P090_37122DSQ_BIG.tif.info.1.{8.1,9.0}
P090_37122DSQ_BIG.tif.info.1.8.1:Upper Left  (-122.5483333,  38.1941667) (122d32'54.00"W, 38d11'39.00"N)
P090_37122DSQ_BIG.tif.info.1.9.0:Upper Left  (-122.5483333,  38.1941667) (122d32'54.00"W, 38d11'39.00"N)