I have no idea if this is a bug or not but after purchasing thorn root finisher from the gem store, it still remains locked in the finishers tab under the Hero panel.
Can anyone help ? 
New Gemstore finishers won't activate
Eh… no one ?
Checked to see if your mailbox isn’t full and there’s a mail you should be receiving with the Finisher item in it?
Checked to see if your mailbox isn’t full and there’s a mail you should be receiving with the Finisher item in it?
Ah… that was the problem. Thank you !!
No worries, same basic thing happened to me once.