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I would need to move the symbol for the end of proof - a square a little bit up but ONLY on one slide, where the proof is quite long and the square has not seen very much.

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Hi Laura! This one quite surely needs a MWE - in this case, a beamer document with only one or two slides showing your situation. The code should be compilable, i.e. start in \documentclass and end in \end{document}. –  tohecz Aug 26 '12 at 18:45
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1 Answer

It's difficult to provide precise advise without a minimal working example; however, the following code reproduces the problem mentioned:

\documentclass{beamer}
\usetheme{CambridgeUS}
\usepackage{lipsum}

\setbeamertemplate{navigation symbols}{}

\begin{document}

\begin{frame}
\begin{proof}
\lipsum[4]
\end{proof}
\begin{proof}
\lipsum[4]
\end{proof}
\end{frame}

\end{document}

the output shows that the qed symbol for the last proof environment almost disappears from the frame:

enter image description here

Adding a convenient \vskip just before \end{proof} solves the problem:

\documentclass{beamer}
\usetheme{CambridgeUS}
\usepackage{lipsum}

\setbeamertemplate{navigation symbols}{}

\begin{document}

\begin{frame}
\begin{proof}
\lipsum[4]
\end{proof}
\begin{proof}
\lipsum[4]\vskip-1\baselineskip
\end{proof}
\end{frame}

\end{document}

enter image description here

One has to be careful about the length used for the \vskip; a value larger than \baselineskip will produce undesired results.

As a personal note, you should reconsider using frames containing too much text (sometimes it's unavoidable, but give it a second thought).

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