--- a/slides/slides10.tex	Tue Dec 02 12:17:03 2014 +0000
+++ b/slides/slides10.tex	Tue Dec 02 12:27:12 2014 +0000
@@ -35,7 +35,7 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
-\frametitle{\mbox{}\\[20mm]\Huge Revision}
+\frametitle{\begin{tabular}{c}\mbox{}\\[20mm]\Huge Revision\end{tabular}}
 
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
@@ -558,13 +558,12 @@
 \end{frame}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[fragile,c]
-\frametitle{6th Lecture:\\[-2mm] Zero-Knowledge Proofs}
+\begin{frame}[c]
+\frametitle{\begin{tabular}{c}6th Lecture:\\[-2mm] Zero-Knowledge Proofs\end{tabular}}
 
 \begin{center}
-%\addtolength{\fboxsep}{4mm}
-%\fbox{\includegraphics[scale=0.3]
-%{../pics/Dismantling_Megamos_Crypto.png}}
+\addtolength{\fboxsep}{4mm}
+\fbox{\includegraphics[scale=0.3]{../pics/Dismantling_Megamos_Crypto.png}}
 \end{center}
 
 \end{frame}