High Sierra - can't insert bars

Maybe only on my install (iMac, High Sierra, latest Dorico). Trying to insert a bar makes Dorico crash without further comment.
Happens on my own music and all templates I tried. As soon as I click “Start of Flow”, “End of Flow”, “Start of Selection” Dorico closes shop.


This thread explains that this was a known bug, which was very quickly corrected - so make sure you have Build 139.