Dear Denis,
a bug with latest xetex:
XeTeX, Version 3.14159265-2.6-0.99991 (preloaded format=xelatex 2014.6.19)
occurs, probably related to color \specials: in the following MWE (say
`test.tex') compiled with xelatex, the text after the tcolorbox
environment on page 2 is colored in white.
latex ---> dvi ---> dvipdfmx ---> pdf
shows the same drawback:
\documentclass[dvipdfmx]{article}
\usepackage{lipsum}
\usepackage{tcolorbox}
%
\tcbuselibrary{breakable}
%
\begin{document}
%
\rule{0.4pt}{17cm}
%
\begin{tcolorbox}[breakable]
\lipsum[1]
\end{tcolorbox}
\lipsum
\end{document}
Therefore the bug may be in (x)dvipdfmx.
Best,
Akira
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