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My 27" iMac runs Stellarium on an ATI Radeon HD 4850 under OpenGL 1.6.7 without issue on OSX 10.6.3. I'm not sure that the ATI cards are the sum of the problem. As comments from both Warren and Andrew intimate, the cards behave differently under various environments. ATI specify OpenGL 3.2 support for this card, so maybe Apple ported it ages ago and run with their own adaptation... ?
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