[pdftex] Collision colorstacks of pdftex-1.40.1 and beamer/pgf?

[Heiko Oberdiek]

On Mon, Jan 15, 2007 at 02:14:21PM +0100, Heiko Oberdiek wrote:

> On Mon, Jan 15, 2007 at 06:29:44AM +0200, Victor Ivrii wrote:
> 
> > I discovered a strange problem with beamer and pdftex 1.40.1 which was
> > not around with 1.30 (not tested with 1.40.0): starting from the
> > really large page (slide) [something around 170] the textcolor in the
> > body becomes transparent (not the case with other colors, like cvolor
> > inside of the theorem, and the only solution I discovered so far is to
> > put \color{black} at each frame or sometimes even after each \pause. I
> > observed it with two long talks I tried. However in the latest run it
> > happened even on page 20!
> > 
> > Example uploaded to
> > http://www.math.toronto.edu/ivrii/beamerwoes/
> 
> Please generate a minimal example,

Done:

\documentclass{beamer}

\useinnertheme[shadow=true]{rounded}
\usecolortheme{orchid}% otherwise "First" would vanish (backgroundcolor?)

\begin{document}

\frame{
  First\par
\pause
  \begin{definition}
  Second
  \end{definition}
}

\end{document}

Some obscurity I found in latex/base/beamerbaseboxes.sty:
  \newcommand\beamerboxesrounded[2][]{%
    ...
    \setbox\bmb at colorbox=\hbox{\color{lower.bg}}
    ...
  }

\color issues \aftergroup\reset at color, thus a
\reset at color is executed outside the \hbox of the
\setbox command. I don't think, this is a good place
for \reset at color. However I don't understand the purpose
of the code with \bmb at colorbox.

Yours sincerely
  Heiko <oberdiek at uni-freiburg.de>
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