5D Mark II Zoom out doesn't work in Live View, brightens display instead

[benlen]

Hey folks, I'm not sure if this is a bug but:

Starting today on my 5D Mark II, when I go to 5x or 10x zoom using the magnification button to check focus, I cannot use the "star" button to zoom out! All pushing this button does is brighten the display at 5x or 10x zoom.

This is super irritating, as I want to be able to quickly go from 5x to 10x and back like I normally would.

What do folks think? Did I brick my camera?

The zoom out button works in Play/Preview mode, but no longer in Live View. Even with a non-magic lantern card, the button does not work as it is supposed to.

Any thoughts?