Same here. Pressing "update navdata" hangs the program entirely. (2024)
Question: if Navigraph is being used for the general sim navdata, shouldn't "sim default" also use it? Or is "sim default" an installer-inserted copy of the default sim data that needs to be replaced by the Navigraph data?
Update: the issue may be that i wasn't on the SU1 preview beta when I thought I was. Will fix that and see what happens.