Its difficult to pinpoint without looking at the scene. As a catch-all solution try deleting the button in your original character file and then re select the objects over again and create a new button.

Alternatively, I sometimes make selection sets that contain all the objects that the animator can key. Then I select this set node in the outliner and assign it to a button. This way i can add and remove items from the set without having to change the assignment to the KeyAll or SelAll buttons.