The ARLL has changed the format of the ADIF File this causes SWISSLOG to pop-up the Assign Import-Fields dialog .
Just press OK on this dialog to continue. The Adif file contains both version of the field, the new one and the old one (APP_LoTW_OWNCALL and STATION_CALLSIGN). Therefore everything works OK
The Assign Import-Fields dialog loooks as follows: