Update: Period Tracker v 1.2 that fixes the hidden calendar issue is now available in the Windows Phone Store. If you were affected by this issue, please do not delete your app but go to the Windows Phone Store and download the latest update. This will fix the issue while preserving all of your past data. Thank you for your patience.
We discovered a bug in our Windows Phone app where starting in 2013, the calendar is hidden and the add note function is not working. Though you may not be able to see your past notes, they are safe as long as you do not delete your app from your phone.
We uploaded an update last night to the Windows Marketplace that fixes these issues. We are waiting for Microsoft to review and approve the update. In the meantime, please do not delete your app as this will cause you to lose your past information. When the update is available, please download it to fix the issue. We apologize for the inconvenience.