there is a strange problem I'm facing in photoshop CS5 running on Lion OSX.
I found out that when I opened photoshop and created new file in RGB 8 mode and started some brush stroke... though my selected color was black it was painting green,,, than I notice that which ever color I take is response to green channel only. I can see the colors in the rgb channel layers but not on my canvas.
when I save it as jpg it comes out ok. and previews ok!!
I tried some color calibration / profiles in color setting but no success.