Update: We’ve uploaded a new build on Jan 1 8:00pm PST that fixes the calendar bug. Windows Phone store will release the update after they’ve reviewed it (hopefully within a week). We’ve requested an expedited review.
Period Tracker on Windows phone has a bug that occurred with the start of the new year. With this issue, all user data is safe in the app. However, the period log page and the calendar page appear to be blank. Also, some users are experiencing a frozen home page and issues with saving a period start note.
We are currently investigating the bug with the highest priority and hope to upload an update tonight or tomorrow. Windows will take about a week to review the update and then it will be live in the Windows Store. In the meantime, please do not delete your app as this will cause you to lose your data.
We are very sorry for this inconvenience. Thank you for your patience.