Not sure if this has been brought up yet but for everyone who has been experiencing ring tone corruption have you tried using 3rd party apps to correct the problem? I've been using Photo Contacts Pro
http://www.pocketx.net/products/photocontactspro_ppc/ for custom rings & Phone Alarm
http://www.pocketmax.net/phoneAlarm.html for custom text, email, voice mail, etc. & I have not come across this problem since I first downloaded this Rom when it was released....just a thought...