This happens when opening a new menu for the first time (when the tutorial tips appear on the bottom right) and instead of closing the tutorial tip, you do something in this new menu (e.g. adding the first mod you find to a blaster).
This makes the menu being unable to close. It happened to me in the armory and also on the mod menu. Only solution is to kill the game process and restart it.
The problem is, I cannot confirm the tooltip inside the mod screen. So everytime I want to add the new mod, I am frozen inside this screen and I have to kill the game process - Nice one.
Really thought maybe this is an EA STar Wars game without game breaking bugs - But no, why would an EA game be different than the others...