I have 3 out of 22 PC's that the add-in send this file is not showing up on the tool bar.
This is only under certain users.
The addin is added under administrator and for all users of the PC.
The add-in is listed in tools->trust centert->add-ins->disable application and cannot be enabled.
This is only on one user on the machine. It dose not matter if the user has admin rights or not. the other 19 computers function fine.