Maybe not strictly a bug, but it looks like SMM 10 didn't resolve the issue I had with SMM 9. I've got an integrated bluetooth carkit which advertises itself as an headset. However, it will only playback audio from the device when there is an active call. This means that I won't hear the voice instructions when the phone is connected to the carkit. I can disable bluetooth and not connect to the carkit and get instructions on the N900's speakers, but then I won't be able to call hands-free. And I can't seem to find a way around that.