Yea, i have always had this problem too...with the ring-tones and the notifications also
I have also rooted and went with the CM7 as well and also been using Light Flow to help with the notifications
but i still occasionally have problems with both the ring-tones and the notifications even still
Ring-tone problems are less frequent - but i still have issues with it forgetting what is the default ring-tone from time to time
The notification sounds are more problematic...They just don't work consistently
i feel your pain...it is definitely frustrating and something that i have just had to live with...unfortunately
and all of this gloating over CM7 - please...it is a help for sure, but it is not the answer to all of the problems this phone has
my audio is still skipping...WiFi is disconnecting all the time - no HDMI, GPS is flaky at best - and that's just what i can think of right off the top of my head
don't get me wrong, i am not complaining, D
http://twitter.com/#!/dragonzkillerrgzkiller and Nitro have been godsends for this phone - and i appreciate them and their hard work all day long
but this phone is a turd for sure, and you cant polish a turd...