So there’s this bug in the calendar app in Mac OS X 10.8 Mountain Lion, where even though the reminders preferences are set to “None”, when you create new events they’ll show a reminder for the day before at 9am.
Having gone quietly mad trying to figure out the problem (there seem to be several solutions listed online relating to editing .plist files, none of which work), the situation and solution is thus:
When Calendar.app is started up afresh, there are 3(4) calendars in it:
- Home
- Work
- Birthdays
- (Reminders)
These have no reminders set in them, however any new calendars created will have the 9am day before default for any events created even if the preferences are set to none.
The solution is to create any new calendars, then create a new event, and open the inspector to you can see the event’s properties. Open the preferences, and toggle the reminders from none, to one of the other options and close preferences. Then open it again, toggle the reminders setting back to none, and close preferences again.
Problem solved.
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