I tried doing a search, but apprently I am the only one to make this mistake for a few years... So, I was trying to change my ical icon, misread the directions, and screwed it up. Essentially, I took the App-empty.icns file, made a copy (just in case), then replaced the original file with the new icon. When I realized my mistake, I erased the new icon file, and renamed the copy file as the original. Apparently my just-in-case plan did not work. When I click on the iCal icon to open the app, it actually turns clear with only the date showing, then I get a couple error messages. These are posted below. If it would be helpful to post the error report to apple, let me know but be warned that it is pretty long (and to me, incoherent). I know that the calendar information has not been compromized b/c I can still see it on my MenuCalendarClock list. I just can't get into iCal to make changes. Any help or advice you may have would be greatly appreciated.