So, I'm getting ever closer to the perfect setup, but not quite there yet....
After a rebuild, I re-installed Maya 6.5. The problem is with the display in the viewport window (5 - shaded). It seems that there is some kind of front face transparency in there. I've seen this before when I used to have SI graphics in my Octane and thought that it was a graphics memory problem (pushing it the screen res. too hard so there was no z-buffer memory left). This is with a V12 DCD running at 3840x1200. I've had the same problem with 1920x1080 via the 13w3 connector. The frame buffer is reporting 35.156Mb used, accumulation buffer is at 17.578Mb & system buffer is 8.938Mb, so there should be plenty of headroom there.
Turning x-ray, transparency sorting, backface culling, interactive shading etc on or off doesn't make any difference.
I've tried both 16 and 24-bit accumulation buffers, and no joy there either. It won't allow me to change the frame buffer depth.
Any help would be greatly appreciated. I'm frustratingly close to actually being able to use it for what I bought it for!