I was recording with my 600d and ML (already did many records like that) when appeared a blue screen alerting of an error and saying to put on live view mode and use the focus peaking on a calendar, on the "today" day.
I did, but nothing happened. Changed my 3 cards (all with the same ML version) and all the three had the same issue.
I formated on the camera, but the bug continued. I had to format one of them on my cell phone, erasing the Ml to record again, but lost everything i had in the first card. When it happened, also had a "dead" moment, the camera just dont waked up!
I Coudnt write de number of ther error, but was that. Somethig, anyone?