I built a companion perk for the undocumented perk list, which gives Invisibility to any companion, while the player is Sneaking. I've tested it on the majority of companions, not all since can't locate my save games from past play, so replaying atm.

I've found two companions in DM who don't seem to be effected by it. Domino and Christine (works fine on god/dog) do actually Sneak when the player sneaks but the Invisibility effect doesn't work on them, anyone got a suggestion as to why?

http://newvegas.nexusmods.com/mods/46944


Thanks for any help.