Re: Notification & Ringtone
Happened to me last night as well.
Might have something to do with using the HTC Sense "Profiles" Widget to switch sound profiles. That's how I was doing it on my Incredible and once in a blue moon I had the problem there as well. Seeing as the widget was still around I added it to my home screen on the Rezound. Currently waiting to see if it happens a second time on my Rezound.
Note: This is using one of the stock replacement ring tones and notification sounds. Not one downloaded with an app. At least for me anyways.