I create a PDF using PDFLatex. When I try to convert it to PS using pdf2ps I receive the following warnings:

$ pdf2ps test.pdf 
GPL Ghostscript 9.05: Error: Font Renderer Plugin ( FreeType ) return code = -1
GPL Ghostscript 9.05: Error: Font Renderer Plugin ( FreeType ) return code = -1

The file test.tex is the following:

\documentclass{article}

\begin{document}
X
\end{document}

With more complicated sources I get the same error, but lot of times more.

The same error happens with dvips when I compile the sources with latex.

If I try to use the PDF directly with, for example, pdftk, it complains and I cannot do it. Instead I have to convert it to ps with pdf2ps (after all the errors, it finally do it), and then to pdf again.

Whether this is a bug in pdfTeX or Ghostscript, I have no idea.

$ latex --version
pdfTeX 3.1415926-2.3-1.40.12 (TeX Live 2012/dev/Arch Linux)
kpathsea version 6.1.0dev
Copyright 2011 Peter Breitenlohner (eTeX)/Han The Thanh (pdfTeX).
There is NO warranty.  Redistribution of this software is
covered by the terms of both the pdfTeX copyright and
the Lesser GNU General Public License.
For more information about these matters, see the file
named COPYING and the pdfTeX source.
Primary author of pdfTeX: Peter Breitenlohner (eTeX)/Han The Thanh (pdfTeX).
Compiled with libpng 1.5.5; using libpng 1.5.5
Compiled with zlib 1.2.5; using zlib 1.2.5
Compiled with xpdf version 3.03