Safari 5.1.10; Smart Copy/Paste greyed out
I want to disable Smart Copy/Paste (Edit > Substitutions > Smart Copy/Paste), as some reading elsewhere suggested that it was behind the shortened URLs I get when I copy, and I really dislike them that way. But everything under the Substitutions submenu is greyed out. How do I fix this?
MacBook Pro, Mac OS X (10.6.8), 17" refurbished