I have my iTunes music etc. stored on my MBP, but movies are on an external HDD connected via Airport disk. When importing movies, I untick "Copy files to iTunes media folder when adding to library" and drag and drop them in - that way the location points to my external drive. However, I imported a number of movies yesterday (in the same way I always have done) and whenever I open iTunes, the artwork of the newest movies is missing and an exclamation mark is next to them. But when I click on it, the exclamation mark goes, the artwork reappears and the movie plays. Quit and reopen iTunes and it's vanished again. Any help appreciated.