Crash when using up arrow in drum editor

Cubase 9.0.10 on Sierra latest.
I have had this crash twice: created a drum track - Addictive Drums - open the editor in drum mode, with a map created by me. When I select a snare hit and wants to move it up with the up arrow Cubase “thinks” that I have the project open and select the track above my drums, and then crash.