I installed everything: jpegtran, optipng, and gifsicle on my VDS.
I gived a 755 right to binaries.
I tried to access this tools from #SU www-data and SU USERNAME and tools WORKS from command line (ssh)!
But inside the blog i see: EWWW Image Optimizer requires jpegtran, optipng, and gifsicle. You are missing: jpegtran, optipng, gifsicle....
And then i enable checkbox "Skip utils check" and try to optimize images.
No results. Why ? :(