我已经使用研讨会文档类多年了，并且有很多旧版 LaTeX 使用它。但我发现累积覆盖不再正常工作，至少在 MacPorts 提供的 texlive 版本 (TeX Live 2016/MacPorts 2016_1) 中不能正常工作。以下是一个最小示例，LaTeX 日志如下，这里是在示例上运行 LaTeX（然后是 dvips 和 ps2pdf）的结果。
我看到过关于 seminar 与 pstricks 最新版本不兼容的参考资料。欢迎提出任何建议！
\documentclass{seminar}
\usepackage{semcolor}
\usepackage{semlayer}
\input{seminar.bug}
\input{seminar.bg2}
\renewcommand{\printlandscape}{\special{landscape}}
\SeminarAltCumulativeOverlays
\begin{document}
\begin{slide}
Zero {\overlay{1} One} {\overlay{2} Two} {\overlay{3} Three}.
\end{slide}
\end{document}
以下是 LaTeX 日志：
$ latex foo
This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016/MacPorts 2016_1) (preloaded format=latex)
restricted \write18 enabled.
entering extended mode
(./foo.tex
LaTeX2e <2016/03/31>
Babel <3.9r> and hyphenation patterns for 47 language(s) loaded.
(/opt/local/share/texmf-texlive/tex/latex/seminar/seminar.cls
Document Class: seminar 2014/01/17, 1.61
Documentclass: `seminar' v1.61 <2014/01/17> (tvz,hv)
(/opt/local/share/texmf-texlive/tex/latex/pst-ovl/pst-ovl.sty
(/opt/local/share/texmf-texlive/tex/generic/pst-ovl/pst-ovl.tex
(/opt/local/share/texmf-texlive/tex/generic/pstricks/pstricks.tex
(/opt/local/share/texmf-texlive/tex/generic/xkeyval/pst-xkey.tex
(/opt/local/share/texmf-texlive/tex/latex/xkeyval/xkeyval.sty
(/opt/local/share/texmf-texlive/tex/generic/xkeyval/xkeyval.tex
(/opt/local/share/texmf-texlive/tex/generic/xkeyval/xkvutils.tex
(/opt/local/share/texmf-texlive/tex/generic/xkeyval/keyval.tex)))))
(/opt/local/share/texmf-texlive/tex/generic/pstricks/pst-fp.tex
`pst-fp' v0.05, 2010/01/17 (hv))
(/opt/local/share/texmf/tex/generic/pgf/utilities/pgfutil-common.tex
(/opt/local/share/texmf/tex/generic/pgf/utilities/pgfutil-common-lists.tex))
(/opt/local/share/texmf/tex/generic/pgf/utilities/pgfkeys.code.tex
(/opt/local/share/texmf/tex/generic/pgf/utilities/pgfkeysfiltered.code.tex))
(/opt/local/share/texmf/tex/generic/pgf/utilities/pgffor.code.tex
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmath.code.tex
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathcalc.code.tex
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathutil.code.tex)
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathparser.code.tex)
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.code.tex
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.basic.code.tex)
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.trigonometric.cod
e.tex)
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.random.code.tex)
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.comparison.code.t
ex) (/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.base.code.tex
) (/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.round.code.tex)
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.misc.code.tex)
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfunctions.integerarithmetic
s.code.tex)))
(/opt/local/share/texmf/tex/generic/pgf/math/pgfmathfloat.code.tex)))
`PSTricks' v2.66 <2016/05/18> (tvz)
(/opt/local/share/texmf-texlive/tex/generic/pstricks/pstricks.con))
`pst-ovl' v0.07, 2016/05/03 (tvz,hv)))
(/opt/local/share/texmf-texlive/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/opt/local/share/texmf-texlive/tex/latex/base/size10.clo))
(/opt/local/share/texmf-texlive/tex/latex/seminar/sem-page.sty))
(/opt/local/share/texmf-texlive/tex/latex/seminar/semcolor.sty
Style Option: `semcolor' for doc style `seminar' 1.02 <2014/01/17> (tvz)
) (/opt/local/share/texmf-texlive/tex/latex/seminar/semlayer.sty)
(/opt/local/share/texmf-texlive/tex/latex/seminar/seminar.bug)
(/opt/local/share/texmf-texlive/tex/latex/seminar/seminar.bg2
seminar.bg2: various corrections for the Seminar document class
added since seminar.bug and few add-ons for overlays
(Version 2.3 of <2014/05/12> (DG, hv))
)
No file foo.aux.
[1] [1] [1] [1] (./foo.aux) )
(see the transcript file for additional information)
Output written on foo.dvi (4 pages, 4240 bytes).
Transcript written on foo.log.