I'm getting weird nullReferenceException and other errors.
Make sure you have the various Repository prefabs in your scene. These are required for automatic operation of the various modules.
Stat values don't update properly!
Check your min/max values. Keep in mind the "Proficiency" is meant to go below 0 at times, as well. If your minimum or maximum values are clamped, your final Value, Proficiency, Points, or Stat will never go beyond that range.