Often I try to use the "Sharpen - Faces" preset in the Lightroom General Presets and it most of the time does not work. The "Sharpen - Scenic" always works and if I press it first, it will allow me to use the Sharpen - Faces preset. This is frustrating.
Same is true for others as well. I keep updating to the most current version (now 5.6) and continue to have the same problem. "Vignette 1" is the same problem.