Persistent Calendar errors
My iCal app regularly warns me with “The server responded: 403 to operation CalDAVSet Property QueuableOperation ”. It then tells me I have to go offline or ignore the error message. Ignoring it just makes it come back later. (I’m running OS X Lion, by the way.) Anthony Brannock One of your calendars probably has some entries that are corrupted or invalid. You should be able to see which one from the text of the error message above the line you quote, but if not, try unchecking your calendars from the sidebar one by one, until the message stops appearing. Now you can try deleting all the old entries in that calendar and re-enabling the calendar. Another way to approach it would be to back up your calendars first using File > Export > Calendar Archive. Now open iCloud Preferences and uncheck the Calendars box. Sign out too, for good measure. Close and reopen Calendar and then re-enable iCloud syncing in iCloud preferences. If even that doesn’t fix it, go to your Library folder (Finder > Go > Go to Folder… and enter ~/Library) and delete Preferences/com.apple.CalendarAgent and Preferences/com.apple.iCal.plist. Restart Calendar and re-enter your account info and see if the errors go away. As a final resort, you could delete the ~/Library/ Calendars folder as well (or drag it temporarily to the desktop, at least), but this will delete any entries you might have in calendars that aren’t backed up.