I have not talked to MaryJane about this lately, so don't know if she has changed anything since I installed her hair package. All you need to do is enter CAS with that Sim, and all is fine. Often, when going to a world where an NPC or townie has had the hair replaced, the textures are not right. Perhaps it's game mechanics of NPC/ townie SIMO files being are tied to the 'factory' hair files. It seems that they don't fully take to already in the game NPC's and townies for some reason. My sister from another mister! There has been one issue with her replacements, that she and I discussed several months ago. You may want to ask MaryJane, she's been replacing a lot of EA hairstyles with CC ones:
