I have been using ML since July 25 this year on my EOS-M with 8G SD card. No problem untill today. The problem: after the camera has been turn on, the EOS-M will AF but will not release the shutter. The only way to make it work is to release the lens and reinstall the lens (both with the camera on). I formated the SD card outside of the camera and use the same card, The camera functions normally (without ML). I use the same card to reinstall the same version of the ML. Same problem. Format the same card with the newest version of ML, same problem. Has anyone run into the similar probl;em?? Has anyone knows how to fix this problem???