Have been using ML for a couple of years without any issues. But after updating my 600d to newest nightly build it worked for several minutes, then just hang displaying some weird pinky matrix on the LCD. Now the camera freezes with blank LCD if i try to:
Enter LiveView (or video mode),
Take a picture (shutter 'clicks', and camera freezes without saving a pic),
Review any pictures.
Have to reinsert the battery to start the camera up again. Tried uninstalling ML, starting up without a card, clearing setting, reinstalling firmware, etc.. Still have the same issue.