Improvements to Lytro Post-processing
It seems that in version 2.0 of the Lytro Desktop app, the way photos are processed from RAW data has changed.
To my eyes, the color balance is much better. The images are also much smoother, which is often better and sometimes just different.
To compare, see the two images below. The first was produced with an older version of the Lytro Desktop app, the bottom was produced with the (new) version 2.0