Edit FilletEdge will not remove fillet

I am working with Rhino Version 7 (7.12.21313.06342, 2021-11-09)
On an iMac 24“ with Apple M1 processor under macOS 12.0.1

When I am using the Edit FilletEdge Tool:
The shift+click to add edge does not work, I merely get a selection box
The ctrl+click to remove edges does not work, the tool just exits.

On the same machine, Rhino V6 works fine. I can shift+click to add an edge and command+click to remove edge.

Can you help?