In several blog sites I created a calendar view of the posts list filtering on the category field. I copied the exact configuration to another site and the items in the list initially showed but then disappeared without me knowingly changing anything.
The items now don't show in the default calendar.aspx page so I've ruled out some conflict with other page elements. I also removed the filter so that's not a factor either. it seems like the calendar view gets corrupted, but how do I debug it?