A few days ago some people noted that the off-screen mode of the GLGraphics object would not work on ATI cards (see the thread in the Processing forum). A new release of the GLGraphics library (0.8.1) that fixes this issue is available for download here.
First of all, it seems to be a problem related to the opengl drivers on OSX, since I tested the off-screen rendering on a ATI 1550 on Windows XP (using catalyst drivers 6.7), and worked ok.
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