I've just performed a clean install on my G4 Powerbook with OS 10.4, and the first thing I did was to begin downloading video podcasts to iTunes. However, while the download status shows podcasts downloading, the data seems to disappear once it's done- the podcast listing goes gray and I can try downloading the same podcast an infinite number of times. I've checked the iTunes director in Finder, and while I see tmp folders for the podcasts, again, they vanish once the download completes. Suggestions?