Hey All, Not sure if anyone else has seen this issue yet, but I cannot seem to solve it. First a bit about my setup. MacPro 2x dual-core 2.66ghz 2x NVidia 7300 GT 3x 22" monitors on ergotron (90 degree rotation) The problem that I have its that 2 of the monitors rotate fine, but one rotates and only shows black screen, but the mouse is visible. No windows, desktop, etc will show up. after the 20 seconds you have to select 'confirm' to the rotation, is cancels and rotates back to normal (0 degrees) rotation. It appears to me that this is effecting the first port in each card, port closest to the side edge of the mac pro. Needless to say, if I cannot work this out, I cannot use 10.6 at all... I should also note, all 3 monitors are exactly the same, however 2 of the monitors have resolution settings choices of: 1000x1600 1050x1680 **the one I use** 1200x1600 Where as the non-working monitor has: 960x1260 1024x768 1050x1680 ** Is there a way I can change the settings via command line to see if that will fix it? Or a preferences file? Any other sugestions? I have tried moving the different monitors to different ports... I have updated to the very latest build of SL. Thanks much.