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

I was very frustrated by the podcast page of Mika since the movies never played on my preferred Firefox browser under Linux. I complained to him and he added the disclaimer These podcasts require QuickTime. They will not run on a generic player. to his Calculus podcasts page.