First off, great rom, I've tried most of them and this one is the best IMHO.
I've noticed a problem since upgrading to 0.8.4. I can set my corporate email notification ringtone to silent, but whenever it restarts, or I reboot the phone, it defaults to the settings it was installed with. I did a wipe, and reinstalled, and set the corporate email settings to be disabled when I configured it. Now when I set it to a ringtone and reboot, it will default back to notifications disabled. It looks as if whatever I set the notification ringtone to, it defaults to the original installed setting when it restarts. Settings for my calendar and gmail persist just fine. Has anyone else seen this? I've seen the same behavior with CM6RC1 (briefly switched roms to see if it was specific to sapphire).