well I tested with it myself, it works fine, no problem at all. Are you sure you trigger has no problem? If you trigger no problem, it should works fine.
you can try sample map I attach below.
type 'hello' (without ' ') to order neutral passive death knight to cast 'Death Knight - Animate Dead'
type 'halo' (without ' ') to order dummy cast 'Neutral Hostile - Animate Dead'
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.