I just downloaded and installed ML on my 5D3 yesterday. First I had the write lock on the SD card so the program could not write the backup (?) files, so I uninstalled it and installed it again. Some weird flickers appeared on the lcd screen after I started to use the camera. The screen got striped and the menu view was mixed with the image view, so you could see the view from the objective stiped with the menu view. One time there was stripes and a whole screen sized text `Cinestyle´. I have Tecnicolor cinestyle installed on the camera, isn´t it compatible with ML? At the moment of the flickers I had FPS override on.
Build: magiclantern-Nightly.2018Jul03.5D3113 Canon filmware 1.1.3