Ghost 15 File & Folder backup hung on last file

Hi, all... Norton Ghost 15 took a whole day to do a file and folder backup of over 100,000 files on my laptop. It is now stuck on the very last file ("Backing up file 105236 of 105236") and has been that way for a couple of hours. The progress bar says "Calculating remaining time." Is it hung, or is it building a catalog or something? What might complicate matters is that the last file is in my Dropbox folder. Thanks