Click the rename button on the UI panel, and a rename popup box appears, showing the current name.
Begin typing a new name. Nothing happens.
The player must, through trial and error, discover that they are also required to click on the name in the popup box, and as if that wasn't enough, they will additionally have to select and delete the old name first.
This should be changed, so that when the rename popup appears, the name box already has the focus, and the current name is preselected so that typing replaces the current name.