Hi, running glxinfo with the latest version (2.1.2), it turns out that glx is at version 1.2, that GLX_ARB_multisample is available on the both of the server and the client side but that multi-sampling is actuall off: Visual ID: 27 depth=24 class=TrueColor bufferSize=32 level=0 renderType=rgba doubleBuffer=0 stereo=0 rgba: redSize=8 greenSize=8 blueSize=8 alphaSize=8 auxBuffers=0 depthSize=16 stencilSize=8 accum: redSize=16 greenSize=16 blueSize=16 alphaSize=16 multiSample=0 multiSampleBuffers=0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ visualCaveat=None I've got a Mac Pro with a GeForce 7300 GT and multisampling is available if I program with the native Apple API's. Thanks for any information, Luc Bourhis