When I did populate for the first time, I thought the software had crashed. But it hadn't. There is a box that shows up, it gets hidden behind the MyLog window and/or sometimes behind the whole application.
Before you start to populate, you should move the MyLog window to the side, so if the box gets hidden behind, it's easily visible and can be selected.
If not, press ALT+TAB and select Airnav Radarbox and it should then become visible. You can then press "OK" to close the box.
This is what the windows should look like after you start to populate.