No records displayed when using Export to ADIF on the File menu

[m0wtn]

When using the "Export to ADIF" option from the File menu the resulting "QSOs to be exported to ADIF" selection window contains "Not defined" and "All" within the "Station callsign" and "Not defined" within "My Locator". Regardless of which options I choose for "Station callsign", "My Locator", "Start date" and "End date" no records are displayed for export.