There's one weird bug in Object-Trigedit, seems that the DG code there can't see INVISIBLE or HIDDEN mobs.
You can test that by having a scripted object doing this:
%force% mobname say ciao
If the mob is INVISIBLE or HIDDEN the %force% command won't do anything.
Can any of the coders check what's wrong in the code and let me know if it's easy fixable?