With the update to 6.0.2, the source monitor displays no image unless I playback or scrub. Soon as I stop playback, the image disappears. I did NOT experience this issue with 6.0.
If I disable hardware rendering, the issue is gone.
MAC Pro 10.6.8
Quad-Cord Intel Xeon
NVIDIA Quadro 4000
I clicked 'no' by accident. Your link to the nVidia was appreciated. The nVidia driver is recommended for Mountain Lion but I have not updated my OS. I'm still using 10.6.8. I forget which 'animal' that is.
As of today, the issue with the source monitor appears to be gone. I have re-actived the hardware rendering and everything is working. I'm not sure what the issue was yesterday.