See upstream bug : http://trac.osgeo.org/gdal/ticket/3458 This is a serious regression introduced during 1.7 development, that will affect warping any sufficiently large image. Wasn't detected by our autotest suite because the test image were small enough, but this will trigger easily with real-life images. I'd strongly advise to apply at least http://trac.osgeo.org/gdal/changeset/19010 It would be also good to apply : http://trac.osgeo.org/gdal/changeset/19014 Reproducible: Always
Try the new rev bump with the patch,
Steve, Thanks for acting on this. Actually, I don't use Gentoo. I've basically "toured" the most known Linux (netBSD as well ;-)) distros that I have found to package GDAL 1.7.1 so they are aware of this issue before users spam your bugzilla or GDAL one ;-)
For the record GDAL 1.7.2 has been released, which includes the fixes