Under preferences you can now choose how Poser should look for stuff. None/shallow/deep. the last one ('deep') is what Poser did always in 4/5/6: If it didn't find a file in any of the locations it made up from the reference (and there are some quite funny ones it checks), it'll search all runtimes for a file with that name. If you switch to 'shallow', it won't do the search, if it doesn't find the file, but ask you to locate it. 'None' will only search within the first runtime folder above where your file has been.