Locked Out of Onboard Playback

[CPTime]

Hey all,

I'm working with a new T3i and recently while fiddling around in the settings, I think I might have messed something up. I'm used to hitting the "play" button in the lower right hand side of the back of the body to display recently captured photos/videos, but just now I've lost the ability to play back video on the LCD entirely except for the most recently shot video.

Any ideas as to what I did/how to fix it? Thanks so much.