I have this problem also, I have three pens which will move the cursor on the board, and right click when I hold the button down. But doesn’t left click. This has happened a number of times, and updating software doesn’t seem to be the issue as a new pen will work fine. Ideally I don’t want to buy new pens when I have three pens which would seem to be not entirely broken. Any suggestions?
It sounds like the component inside the ActivPen which allows for the left click may be broken. Once way of testing this is to get the nib of the working ActivPen and try this in the one that doesn’t appear to left click and see if this works. If it doesn’t work then we would recommend purchasing replacement ActivPens. If this starts to work you can purchase replacement nibs for the ActivPen.