You can't add a shortcut of a entire folder into your Fav it will give you an error! You also need to be careful by adding linked fies into the Fav folder these will remain permanent in the folder, meaning they only can be removed by accessing the folder directly, if you try removing a shortcut through the poser internal library it will NOT remove the shortcut it will kill your original file. The best solution for the Fav is to access it through the Explorer by adding a copy of the folder with the files into it, this way it will work just fine to add entire folders and you will stay out of risc loosing original files by trying to remove a fav link through the Poser library. In short terms " Only manage your Favs through the Explorer and Not through the Poser Library " Adding Fav's is not a problem but for sure removing them.