I tried changing the login background as describe in http://forums.macrumors.com/showthread.php?t=241007 and when it didn't work I tried reversing the process and that didn't work either. I then tried clearing the caches with Onyx and repairing permissions but nothing worked. Anyway, now after a restart I have a 'recovered files' folder in my trashcan which contains a '3243499065' folder which contains an 'EWSMac.framework' folder and a 'EWSMacCompress.tar.gz' file. Can someone tell me what's going on and how to straighten it out. Thanks.