I moved all photos to a new ext drive (they used to be on the c drive); reformatted my desktop computer; reinstalled LR4. Now there is no parent file under the name of the ext drive on which I can right click and "create a folder inside....". I am able to create new folders in the existing subfolders. There is also no way to sync the drive to find a new folder I created via Windows explorer. My filing system is by month and year so now with each passing month I am not able to set up a new file. Help!