Every time I open the period tracker in the app it forces the app to close. I can occasionally open the period tracker with the "+" button, but I want to adjust the period length and look at history which is not accessible from the "+" button. Also, even though I may be able to open the tracker with the "+" button it forces the app to close when trying to add information.
I have sent several "Feedback" when the app is forced closed and I get the option. This began after upgrading to the new app lay out.
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this seems to be a known bug that fitbit are looking into. Keep an eye on the following thread where they are posting updates: