Use case:
Open Cog.
Add music from an external drive
Close Cog (it saves its playlist automatically)
Disconnect external drive
Open Cog
Crash.
Crashes both on 10.4 Tiger and 10.5 Leopard.
I think it tries to load ID3's from the playlist but as the source drive isn't present it crashes.
It's really annoying as I happen to use this scenario a lot (I have a laptop, at home I connect to an external drive, at work I no longer have this external drive attached).
Regards.