Beamer, Babel and Tikz conflict

Question

I am preparing lecture notes in Turkish, and I have a digram for mathematical modelling procedure. But I cannot produce a good output for the following code. When I remove the first three packages, I get my desired output. However, I need to have keep them in my document. Would you help me in this direction?

\documentclass[10pt,notheorems]{beamer}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[turkish]{babel}

\usepackage{tikz}
\usetikzlibrary{positioning,shapes,arrows}

\hypersetup{bookmarksdepth=4,bookmarksnumbered=true,bookmarksopen=true}

\usetheme{Warsaw}
\usecolortheme{seahorse}

\begin{document}

\begin{frame}[fragile]{}{}

\begin{figure}
  \centering
  \begin{tikzpicture}
    \node (rwp) [draw,fill=blue!20,text centered,minimum height=2em,rounded corners] {Ger\c{c}ek ya\c{s}am problemi};
    \node (mm) [right=2cm of rwp,draw,fill=purple!20,text centered,minimum height=2em,rounded corners] {Matematiksel model};
    \node (mc) [below=2cm of mm,draw,fill=green!20,text centered,minimum height=2em,rounded corners] {Matematiksel \c{c}{\i}kar{\i}m};
    \node (rwq) [below=2cm of rwp,draw,fill=red!20,text centered,minimum height=2em,rounded corners] {Ger\c{c}ek ya\c{s}am tahminleri};
    \path [draw,->] (rwp.east) -- node [above] {Form\"{u}lasyon} (mm.west);
    \path [draw,->] (mm.south) -- node [right] {\c{C}\"{o}z\"{u}m} (mc.north);
    \path [draw,->] (mc.west) -- node [below] {Yorum} (rwq.east);
    \path [draw,->] (rwq.north) -- node [left] {Kontrol} (rwp.south);
  \end{tikzpicture}
  \caption{Modelleme s\"{u}reci}\label{s2ss2fig1}
\end{figure}

\end{frame}

\end{document} 

Answer 1

Babel defines various shorthands to simplify the input of special characters, which is very handy to input letters, but sometimes this causes conflicts with others packages. Luckily tikz has the library \usetikzlibrary{babel} that solves the problem.

\documentclass[10pt,notheorems]{beamer}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[turkish]{babel}

\usepackage{tikz}
\usetikzlibrary{positioning,shapes,arrows}

\usetikzlibrary{babel}

\hypersetup{bookmarksdepth=4,bookmarksnumbered=true,bookmarksopen=true}

\usetheme{Warsaw}
\usecolortheme{seahorse}

\begin{document}

\begin{frame}[fragile]{}{}

\begin{figure}
  \centering
  \begin{tikzpicture}
    \node (rwp) [draw,fill=blue!20,text centered,minimum height=2em,rounded corners] {Ger\c{c}ek ya\c{s}am problemi};
    \node (mm) [right=2cm of rwp,draw,fill=purple!20,text centered,minimum height=2em,rounded corners] {Matematiksel model};
    \node (mc) [below=2cm of mm,draw,fill=green!20,text centered,minimum height=2em,rounded corners] {Matematiksel \c{c}{\i}kar{\i}m};
    \node (rwq) [below=2cm of rwp,draw,fill=red!20,text centered,minimum height=2em,rounded corners] {Ger\c{c}ek ya\c{s}am tahminleri};
    \path [draw,->] (rwp.east) -- node [above] {Form\"{u}lasyon} (mm.west);
    \path [draw,->] (mm.south) -- node [right] {\c{C}\"{o}z\"{u}m} (mc.north);
    \path [draw,->] (mc.west) -- node [below] {Yorum} (rwq.east);
    \path [draw,->] (rwq.north) -- node [left] {Kontrol} (rwp.south);
  \end{tikzpicture}
  \caption{Modelleme s\"{u}reci}\label{s2ss2fig1}
\end{figure}

\end{frame}

\end{document}