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From: Richard Quist <rquist_nospam_@mathworks.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Hardcopy is black - help
Date: Wed, 22 Aug 2007 07:24:41 -0400
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Geico Caveman wrote:
> Hello
> 
>         I have had this problem before with this script that plots some 3D data
> (surf). The figure window shows a nice plot. The hardcopy (pdf and png)
> simply consist of a solid black rectangle where the plot ought to be.
> 

This usually indicates a problem with the opengl driver. Try starting 
MATLAB with the   -softwareopengl   switch