I've just updated to Mac OS X Lion 10.7.2 build 11C48 after running the included Reversioner. I then installed iCloud beta 10. System Preferences now crashes every time I try to login to iCloud. I get the message "System Preferences quit unexpectedly". I've also tried adding a new iCloud account via System Preferences > Mail, Contacts & Calendars > Add Account > iCloud. I get the same result doing it this way unfortunately. I've tried reinstalling iCloud again several times, with no luck. Has anyone else had this problem or found a solution?