[texhax] Beamer and times

[kubulaaaaa at centrum.cz]

Hello,
I install texlive 2013 (windows, full scheme).

When I use font times 

\usepackage{times}

in beamer

\documentclass{beamer}

some symbols 

\Delta \Omega are not correct (black squares). 

I use pdflatex. There is no error in log. This ?bug? is only in beamer, in article are symbols OK. 

In texlive 2012 is everything OK.

Is mistake on my side or is it bug in new version?

Thanks for answer.

Jakub Stryja