Please update for iOS 10
Widgetcal 1.4 for ios 10 has many bugs. The app also runs very slowly and frequently hangs or freezes even on an iPhone 7 (especially for facebook calendar events).
Widget issues: 1) week view frequently refreshes when opening widget view 2) the animation is distracting and wastes time, events for the day should be kept in loaded state and not flash or disappear. 3) Similarly, I find events for the day will not always display and require tapping on another day and then tapping back.