After upgrading to 10.2.3 through the software update panel, my iMac can no longer run 1024x768@75 in thousand or millions of colors. There's no problem if I run it in 256 colors or in 800x600.
It looks like it runs at a refresh rate it can not handle, due to abnormalities on the screen.
Does anyone know why? Since it ran with no problems in 10.2.2..
