The following command: gswin32c -dTextAlphaBits=4 -r300 "attachment 6537 [details]#.ps" displays the glyphs with some sort of while lines or highlights on most of the glyphs. ("attachment 6537 [details]#.ps" is the "Simple sample file" from Bug # 691494.) I don't see these artifacts on the master branch. The resolution does not really matter, but the higher the more clear the white lines are. At low resolutions, the glyphs look just "broken".
Created attachment 7681 [details] Screenshots. Screenshots from current master and gs903 branches.
This was fixed in commit 'a1ee78a6de94b8b4292b9ce3b71b54ed3ae7502b ' here: http://ghostscript.com/pipermail/gs-cvs/2011-June/013051.html The commit is in the master code and will be in the GhostPDL 9.03 branch shortly.