Luís Oliveira wrote:
If no one offers some useful insight in the meantime, I suggest you send a small (the smaller, the better) example that triggers this issue so we can try it ourselves.
no need to supply anything. you can just load-op cl-glut-examples and try (dotimes (i 2) (cl-glut-examples:render-to-texture)) to trigger the effect.
it doesn't get much more simple than this example: it just renders a teapot onto a texture and then applies this texture onto two quads.