I formatted card in PC, formatted in camera, EOScard utilitied it, put on the latest ML, but REPLACED the autoexec.bin with Alex's. I then started taking many photos, videos, etc. No shutter bug.
I then put the lens on my other EOS-M body with a 9/26 build, or something like that. No shutter bug. Took RAW, took H.264, took photos. turned camera off and on, many times, switched the dials, etc. No shutter bug.
Put lens back on new body, took more photos video, no shutter bug.
Outside my house, turned camera on, aimed at motorcycle, had red square, tried to take photo. SHUTTER BUG. It was low light. I also noticed that changing the shutter/aperture didn't change meter. I think there is a good chance the camera wasn't exposed/focus locked correctly on that first shot--that wouldn't fire. This is camera that has NEVER loaded ML. Only Alex's autoexec.bin.
Neighbor came over and we got into 15 minute conversation. After he left I turned camera on, problem gone. I took photos. NO SHUTTER BUG.
So the only thing I can see that may have caused it was the camera not being set to the proper exposure/focus for shooting and then freezing.
Hopefully this means something to 1%.