Installation of update 3.1.3 changes the default setting of the metadata popup from T to control-T. If you have a custom command set, it will remain as it was before the update. If you switch back to the default set, you will see the change.
Oh man… this goes back a ways. 15 years, to be exact. Check out this old video of me on Apple stages in 2004 showing Motion at NAB and Apple Expo Paris!