When I append an object from a 'spare part' Blender file, its modifiers (SubSurf and boolean) don't work. Their names are highlight in red in the stack modifier. Even if I remove those modifiers from the source file, I can not still apply them in the second file.
I've tried to set this object as Unique (U) or Local (L) in both files; nothing new!
Any idea about that behavior? (Blender 2.74, W. XP)