[pstricks] Texlive 2009 and seminar

[Brument Gérald]

 Bonjour

When I tried to compile seminar documents with texlive 2009, I get the 
following error :

! You can't use `the character 2' after \the.
\paperwidth ->2
               10mm
l.251 \end{slide}

It doen't happen with texlive 2008 ...

Thank you in advance