Option Key Mac stopped working (duplicate object / artboards)

[artnok]

Don't know what's happening, the option/alt key on my mac stopped to work in Affinity Designer. 
I can't duplicate objects or artboards... I restarted my computer, works fine on illustrator, photoshop and any other program. Affinity does not recognize my alt key anymore. 

Any idea??? 
Thanks a lot for your feedback. 

N. 

[artnok]

I must precise, alt key perfectly work to increase or decrease brush size added to control key. 
So weird... 

 

[walt.farrell]

Cmd+Drag should make a copy of an object and move the copy.

Opt+Drag should make a copy and move the copy while ignoring any Snapping options you've setup.

(And Drag, of course, implies a left-click of the mouse.)

 

[fde101]

Are you sure you have the move tool selected?

Option to duplicate works just fine for me when I have the move tool selected, but it invokes different behaviors with most of the other tools - for example, with the shape tools, it ignores snapping; with the node tool, it converts smooth points to sharp points; etc...