Contact Birthdays Not Showing In Calendar

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http://forums.androidcentral.com – Does anyone know how I can get my contacts birthdays to show in my calendar? When I go into calendar and click on calendars to be displayed, the contacts birthdays calendar is checked but does not appear in my calendar. The only way I am able to show the contacts birthdays is if I go to calendar and calendar storage in apps and clear the data (HowTos)