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[Public WebGL] black patches in background

Title: black patches in background
I have some users on Windows XP who report black patches and artifacts in the background on this visualization: http://visual-demos.dev.concord.org/seasons/earth/index.html

They report using MW Windows XP Professional on an HP AMD Athlon II P320 with an ATI Mobility Radeon HD 2450 Graphics cardswith700 MB memory on Chrome 9.0.597.83 beta.

The code uses SceneJS and is available in this repo:

Here's an portion of the rendered screen showing one of the black patches and another squiggly-line artifact.

Anybody know what is causing this and if there is anything I can do about it?