I have been creating Podcasts using Keynote and iMovie. This has been working fine, and I have created podcasts that cover a basic calculus course completely.

Yesterday I needed to create another podcast. I started my Keynote, produced and recorded the presentation, and exported it to Quicktime. But no sound. The recording did not play anymore when the presentation was exported to Quicktime.

I found out that the culprit was the new version (4.5) of Quicktime. See
http://www.macfixit.com/article.php?story=20080617143056579. Downgrading Quicktime 7.5 to Quicktime 7.4 helped, and I got my sound back to my presentations. Observe that you need to downgrade Quicktime, not the Quicktime Player. So I finally got to sleep at 3 am this morning.

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