This is a bug already discovered in Ubuntu (see URL). Ghostscript changed processing defaults so ps2fax and pdf2fax (etc) cannot generate a valid TIFF. The result is that the fax recipient only gets an empty page. The fix described there (MaxStripSize=0) resolves the issue. Involved versions: net-misc/hylafax-6.0.3 app-text/ghostscript-gpl-8.71-r1 I propose to use the MaxStripSize=0 approach in HylaFax to make it more robust to ghostscript upstream changes. Reproducible: Always
You may get Debian patches from http://patch-tracker.debian.org/package/hylafax/2:6.0.4-10 . It is the one called 808_ghostscript_args.patch and keep two corrections: the one you already proposed in this report, and adding '-P' that seems to be required with '-dSAFER=true'
Closing as WONTFIX because hylafax was removed from Portage. But adding 361187 to Blocks: -line since this bug should get fixed if introduced back to Portage.