I successfully loaded Magic Lantern onto my T2i using a class 10 32 GB microSD card in an adapter. When my new Transcend Class 10 SDXC 64 GB card came in, I tried to load it back on but it failed in the process. I had to pull the battery both times to get the camera to turn off/restart.
Anyone have this issue? The camera takes photos and puts them on the card with no problem. I was using the no flash auto settings.