I installed Magic Lantern on my Canon EOS M. Eventually the shutter is blocked and you can´t take a picture. The problem is more common with the 22mm F2.0 lens than with the 18-55mm lens. Does anyone know how to fix this problem?
Temporary fixes seem to include partially dismounting and remounting the lens, or power-cycling the camera.
It looks like this is an actual bug in the EOS M build, and they're having a very hard time diagnosing what's going on, although they now suspect it's an issue with the bootloader. I'd suggest going to the thread on this bug and seeing if there's anything you can do to help, testing or debugging-wise.