When I select a specific view for a calendar web part and "apply" the settings, the web part shows the view correctly (with the calendar items). However once I have "saved", the settings I have selected do not appear in the web part view. I've confirmed that the View I have selected includes the items that should be viewable, however nothing is populating in my web part view.
Check your Web Part Page for additional hidden calendars.
Choose Edit Properties from the Page tab of the ribbon. From there, select "Open Web Part Page in maintenance view." Check and delete any extra calendars you don't want, or, to be safe, delete all of them and re-add the calendar you want.