[PROBLEM] No audio on many AAC files

[IriDium]

Ok - I've got the file - so you can delete it from Dropbox.

I've tried in on my Beta 2 RPi and it plays perfectly Video (via HDMI) and Audio (via analog).

I would try plugging in some headphones into the analog port and see if you get sound there.

If not, then it looks like you will have to look at upgrading. (If you have a spare SDHC card, try installing a fresh Beta 2 first and see if that improves things).