Dynamic hair should be saved to the hair library as a prop.  Even in Pro 2014 it is still recommended that you use a skullcap or some other prop to parent the hair groups to.  I know you don't need one but when you go to save the strand hair prop, that is the first warning dialog that comes up. 

How are you saving the hair?  You should simply pick the prop it's parented to and click the add to library at the bottom of the hair library. 

When you reload the hair, are the guide hairs still present?  If you take it into the hair room will the rest of hair repopulate?