[R--gR] Save as postScrips latest R version

Hi,

I was using the 2.4.1 R version and I had no problem
saving my plots as postScript. Now that I have
installed the latest version 2.6.0 I can not save any
plot as postScript. When I try the following message
appears:

Erro: Invalid font type
Al?m disso: Warning messages:
1: font family not found in PostScript font database 
2: font family not found in PostScript font database 

What should I do?

Thank you in advance,

Camila

Camila Pedroso Estevam de Souza
  Mestrado em Estat?stica - UNICAMP
  Master's Degree Student in Statistics - State University of Campinas