When pressing Scan button unity hangs

On version 5.1.4, 5.1.6 when pressing scan button in AStarPath inspector Unity hangs.
With message in progressbar:
Waiting for user code in AstarPathfindingProjectEditor.dll to finish executing.

Hi

I’ll need some more information to help you. Have you checked the log?

Yes. Its last message was PreProcessingGraphs

In Settings I tried setting Thread Count to None. Didn’t help, same result

As a workaround was able to save graph on different machine and load it at startup instead of scan.
Still would like a proper fix for a scan