"Show sampling ring" question

I'm using the eye dropper and the "Show sampling ring" box is greyed out.  I can't click it to toggle it on or off (it currently has no check in the box so it is off).  How can I get it to toggle on?
Thanks for the help.

It sounds like you don't have a video card that can run the GPU feature set, or Enable OpenGL Drawing is just turned off. Go to Preferences> Performance> GPU Settings and see if the option to turn it on is available.
Another quick test to see if you have OpenGL enabled is to press the and hold the R key down. If you get the Rotate View tool icon displayed hovering over an open document then it is On.
regards,
steve

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