Ah, I get you now, thanks for clarifying. I'd never pressed the cam key in those circumstances.

Having just fooled around with it, I also now see what the other bug (about system notification tones) is about. I've managed to get my phone into a state where even with the media player 'closed', I'm only getting the little unobtrusive beep/vibration to indicate new email/SMS rather than my usual custom tones.

That explains why I have been failing to notice SMS's while I'm out and about and have been using Querty's cam key to control audio. A reboot of the phone fixes this, but it is indeed a nuisance!