Canon T3i Live View problem
Magic Lantern Menu, 2nd icon Expo, make sure EXP Override is set OFF. Then LV Display underneath that is set to, Photo, No ExpSim. Then check 7th icon Display, LV display gain should be set at 0.0 EV.
That should help. Magic Lantern is great, but it can be confusing with double amount of menu. I have an extra normal card.