Hi Warrensg, have you tried reinstalling Scratch LIVE? If this hasnt solved the problem, please try renaming your "database V2" file, which is inside your ScratchLIVE folder (inside your Music folder on Mac, or My Music folder on Windows.) If you're using an external hard drive, you'll need to rename the database V2 in there as well.
You could also try the latest 1.8.2 Beta version, which is available here:
www.serato.com . If you decide to try it, please keep in mind that it's still a Beta, and its highly recommended that you follow the indications before installing it. Let us know how it goes. Cheers.