So I just did an update to 5.0 on my tour, and everything works well EXCEPT calendar. My calendar events are all displayed, however random ones will not allow me to edit. It opens, and when I use my trackball to scroll down the time or description the trackball dissapears and you cannot do anything.... Also, when I go to add a new appointment, same thing happens...odd...HELP!!

Did you do a device wipe before you installed the new OS? Some people have reported data corruption issues and doing a wipe forces it to start with fresh databases.