Sometimes, when I add a folder to a directory within a catalog, and "sync" it, I am unable to open the file in its proper location in Windows Explorer. Instead, it just opens up my root directory (with my C, D, and removable drives). I can't figure out why this is happening, because some of the photos work properly and others do not, even though they were made in the same way and moved into the folder at the same time. Any idea what is causing this?