[Rd] Postscript saving failed. (PR#10473)

[zliu at fau.edu]

Full_Name: Zhihua Liu
Version: 2.6.0
OS: 
Submission from: (NULL) (66.176.38.107)


When I produced a .ps graph in the screen, I had problem to save them. The
following warnings show up: 

Error: Invalid font type
In addition: Warning messages:
1: font family not found in PostScript font database 
2: font family not found in PostScript font database 

But it works fine with R 2.5.0.