I have been having the same problem - photos show, but the music does not play - the scanner icon (rotating arrow) keeps scanning, but music does not play at all.

So I did the Canola-cleanup again... I had done canola cleanup once before, before I switched from Beta 2 to Beta3.

This time however after cleanup - I rebooted, and then installed Canola Beta 3 again (from Application manager). And now Canola works - i.e. the music plays.

I still need to reinstall the Canola Tuning of course.
Even the podcasts are working again - had to re-download all the podcasts again though.