Occupancy and Availability reports incorrect

Q: Why do my Occupancy and Availability reports show all 0's instead of correct data?

This is most likely due to the filtering, since each type of report always uses the last filter settings used.  In the report dialog, click "Site / Reservation Filtering", then click "Reset Filtering (include all)", then click "OK".  Don't forget to Generate the report if you don't have Auto-generate selected.