According to NVIDIA AddARGBGLXVisuals can be specified either in the Screen or Device sections. For example Restricted Drivers Manager puts it in the Screen Section. I don't know why this should cause problems.
It is true that Envy adds these lines (if required):
Section "Extensions"
Option "Composite" "Enable"
EndSection
However I don't know where this option comes from:
Option "MIT-SHM" "no"
Envy is not programmed to add that line. Maybe some other application modified your xorg.conf.
According to NVIDIA AddARGBGLXVisuals can be specified either in the Screen or Device sections. For example Restricted Drivers Manager puts it in the Screen Section. I don't know why this should cause problems.
It is true that Envy adds these lines (if required):
Section "Extensions"
Option "Composite" "Enable"
EndSection
However I don't know where this option comes from:
Option "MIT-SHM" "no"
Envy is not programmed to add that line. Maybe some other application modified your xorg.conf.