Created attachment 48936 [details] glxinfo output If I understand the code correct, every window must draw a triangle with the same texture, but only the first triangle is checkered, the others are half black and half checkered, but the checkered part is dark green and very dark green.
Mabye an issue with texture sharing among contexts.
Created attachment 50088 [details] glxinfo output on another computer, wher manywin crashes The demo is also not working on my computer... here, it opens very briefly the two windows and then crashes, without any error message. ("manywin -s 2" and "manywin 2" both suffer from this problem)
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