I'am thinking that you seam to use a particular methode to edit in padstack editor because,on my concerne,I do not use at all "right>click mouse button" to edit anything,but rather I open the main/sub padstack menus and select directely the layer I want to add/delete,
The add/delete button is always active (except for top,bottom and inner for sure)
I would like to ask you to describe précisely your methodologie to edit padsstack (if you wish)
and I will enjoy to make working my minds!
Vincent.