Hi Muriel
I took a look at the code in the section for the Workpiece dialog, and I don’t see anything that should be out of the ordinary. I have read a report of the same issue elsewhere, so it may be Qt / MacOs issue. There is maybe one thing I can see that might be causing the issue, but if that’s the case I would expect the same behavior with a couple other context menus.
If maybe you could check these menus as well I could rule in / out my suspicion… either the Group Manager or Pattern Piece dock areas:
If these work, then I’m at a loss at this time for the cause of the issue.
That being said… I may have misunderstood, but have you tried to open the Path context menu, then using the up down keyboard arrows to highlight an item, followed by to select / toggle the item?