Optical spacing -- no more?

[James Harkins]

Something I've been wondering about for awhile... lilypond.org boasts of 
"optical spacing" for notes with alternating up and down stems, but it 
seems this feature has been lost somewhere (or disabled by default). In 
this example, it's quite plain to my eyes that the stems are not equally 
spaced within the bars.

\version "2.18.2"
\relative c'' { e4 c, f' d, g' e, a' f, }

Which is correct -- the website, or LP's behavior?

hjh