As for me I NEVER had the ring corruption issue until today RIGHT after I installed the WM7 Titanium Project cab listed earlier in this thread. so I removed the cab and reset and issue was gone. I have since installed the cab again and reset and have yet to get the issue.
WM7 Titanium FIX: On another note I have fixed the Notification Expanded Menu and have repositioned the clock and date slightly thus fixing the overlap issue. Attached are the .cpr files.
EDIT: Forgot to attach files. Install by disabling Titanium, unzipping the files to windows directory, and restarting Titanium. This will fix both portrait and landscape modes. Also have my transparency for the expanded background to .1 so you may want to change it back if needed...can find info on how to here
http://forum.xda-developers.com/show...05&postcount=2