The swoosh in the attached file is rendered as a one colour in Ghostscript but is rendered as a gradient in Acrobat, Apple Preview, and mu. The command line I'm using: bin/gs -sDEVICE=ppmraw -o test.ppm ./gradient_hook_a.pdf
Created attachment 8432 [details] gradient_hook_a.pdf Cut down version of customer supplied file.
This appears to be a softmask issue. Should have resolved fairly quickly
This was a soft mask issue and fixed with Alex's commit http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=1ff339b6aca7087e32be7516fda9ef0b9df38e72