I copied this code from this answer.
\documentclass[tikz]{standalone}
\begin{document}
\tikz [blend group=screen] {
\fill[red!90!black] ( 90:.6) circle (1);
\fill[green!80!black] (210:.6) circle (1);
\fill[blue!90!black] (330:.6) circle (1);
}
\end{document}
I compiled it with XeLaTeX, the result is the following:

(FYI it's just a white square)
And this is the output from pdfLaTeX and LuaLaTeX:

Which is what I was hoping for.
Is this some kind of bug in XeLaTeX? Did I miss something?
Edit: Mark Wibrow in the comments linked this answer, that was compiled with xelatex. Now, my experience with tikz and related graphic packages is very limited: I don't really understand what I'm doing wrong here, but even if it's somehow fixable I'm pretty sure that xelatex and lualatex shouldn't produce such different outcomes.
PGFandPSTrickswas compiled with xelatex from TeX-live 2013. – Mark Wibrow Jul 03 '14 at 17:42xelatexand produces the intended result. Possibly a version problem. The commandxelatex --versiongives meXeTeX 3.1415926-2.5-0.9999.3-2013060708 (TeX Live 2013). – Mark Wibrow Jul 03 '14 at 18:16XeTeX 3.14159265-2.6-0.99991 (TeX Live 2014/W32TeX), last version of TeXLive on Windows 8 – izabera Jul 03 '14 at 18:31XeTeX 3.14159265-2.6-0.99991 (TeX Live 2014). I can also reproduce withXeTeX 3.1415926-2.5-0.9999.3-2013060708 (TeX Live 2013). WithXeTeX 3.1415926-2.4-0.9998 (TeX Live 2012), I get a complaint aboutblend modebut I do get the circles in the PDF - just not blended as expected with an older version oftikz. This is GNU/Linux x86_64. Not sure why you don't see the problem with the same version of XeTeX as my 2013 one. – cfr Jul 04 '14 at 22:17ghostscriptversion? Mine is9.14. – Mark Wibrow Jul 05 '14 at 06:44ghostscriptorxelatex, it is beacuase I am using the latest CVS version ofPGF. See my answer below. – Mark Wibrow Jul 05 '14 at 08:56