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I am trying to write a presentation in beamer with notes in a separate page. I am using the pgfpages package. When I compile the file only with the slides everything appears to be fine. When I use the option to show notes on the second screen, then any slide with math becomes blank. Here is an example of what I did,

%!TEX TS-program = xelatex
% !TeX encoding = UTF-8
\documentclass{beamer}
\usepackage{pgfpages}

%\setbeameroption{hide notes} % Only slides
%\setbeameroption{show only notes} % Only notes
%\setbeameroption{show notes on second screen=right} % Both
\usepackage{libertine}
\usepackage[english,greek]{babel}

    \title[CMB]{Παράδειγμα τίτλου}
\author{Γιώργος Παπαδόπουλος}\institute[ΟΚΕ]{Όνομα Πανεπιστημίου}
\date{\today}
\begin{document}

    \begin{frame}\titlepage \note[item]{Χαιρετισμός}\end{frame} 
\begin{frame}{Outline}
    \tableofcontents
\note[item]{Say hello}
\end{frame}

\section{Σχετικότητα -- Κοσμολογία}
\begin{frame}{Einstein}
    \[R_{\mu\nu} - \frac{1}{2}R g_{\mu\nu}  =   -\frac{8\pi G}{c^4} T_{\mu\nu}.\]
\begin{equation}\label{eq:gr einstein equation}
R_{\mu\nu} - \frac{1}{2}R g_{\mu\nu}    =   -\frac{8\pi G}{c^4} T_{\mu\nu}.
\end{equation}
  \note[item]{Η βασική ιδέα της γενικής σχετικότητας} 
   \note[item]{Η αρχή της ισοδυναμίας}   
   \note[item]{συναλλοίωτη μορφή} 
   \note[item]{μας λέει οτι υπάρχει ένα σύστημα συντεταγμένων στο οποίο οι σχέσεις ισχύουν, το σύστημα το οποίο είναι τοπικά αδρανειακό στην χωροχρονικό τόπο του
  συστήματος που μελετάμε.}
   \end{frame}
\end{document}

The result is as follows with no notes pages, Slides only

And with notes pages,

enter image description here

Even the text disappears. Does anybody have any ideas?

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Thanks for you fast answers, I thought it was a problem in math and so I did not find these posts. What seems to have fixed the issue is using the link that leandriis posted, Normal text is invisible when using beamer with notes and XeLaTeX

As mentioned in that post, I used the following code just before the frame,

    \def\beamer@framenotesbegin{% at beginning of slide
    \usebeamercolor[fg]{normal text}
    \gdef\beamer@noteitems{}% 
    \gdef\beamer@notes{}% 
}
\makeatother

Slides reappeared.

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