If you find that you're unable to scroll the timeline below the map after updating to iOS 10 (as demonstrated here: https://youtu.be/m-e2dB9kWbU), the resolution is to delete and then reinstall the app.
We're unsure what causes this issue or why this fixes it, but it has been proven to work for one user affected by this issue (we've only had a handful of reports of it).
If you have saved locations that you'd like to retain, please click on the Locations tab and then choose Synchronize at the top left. (Sign up for an account if necessary.) Synching your locations will ensure they're available to resynch after you reinstall the app.
You may also wish to export your saved location to KML (using Export Locations in Share/Action at the top right of the Map screen) prior to deleting and reinstalling the app.