Run from Terminal:

defaults write -g QCShowPrivatePatches 1 defaults write -g QCShowPrivatePatches 0

Courtesy of Kineme.

http://kineme.net/QuartzComposerPatches/GLTools/1.1

Quartz Composer 3.1 patch install location:

/Library/Graphics/Quartz Composer Patches/ ~/Library/Graphics/Quartz Composer Patches/

and NOT

/Library/Graphics/Quartz Composer Plug-Ins/ ~/Library/Graphics/Quartz Composer Plug-Ins