It does it every time on this particular file.
It is a 4K 60fps file, from the new DJI Osmo Pocket stabilised camera.
So I tried it with V14 (having deleted the .sfk files) and that hangs at the same point (16% in) on the same file.
Both progs have to be killed with Task Manager.
The file plays fine with VLC, which shows this media info:
http://peter-ftp.co.uk/screenshots/20181228163503019.jpg
Does anyone have any ideas on how to salvage this situation?