Thumbnail caching can cause a problem when attempting to copy and paste KVB projects from one folder to another, such as for saving projects to a network drive.
If thumbnails are cached, Windows will generate a file named "Thumbs.db" and place it in every folder containing a picture file.
KVB projects contain picture files. If the Thumbs.db file is in a KVB project, then that project file cannot be completely copied and pasted into another folder. All files in each folder past "Thumbs" in alphabetical order will be lost.