Quote - I never have really understood why Poser needs to search through the Runtimes for files whose paths are defined. I know they are relative paths, but within each Runtime, at least, they are fully defined, aren't they

If they are correct, Poser won't search. If search depth is set to none, Poser won't search for the file anywhere, shallow should look in the current runtime and full in all. (But the search mechanism isn't doing that in a rather poor way...)