Module mlv_play destroyed all data on CF. I played some MLV videos and suddenly camera turned off. I do not know the exact reason. It happened to me in last version (2014-06-23), but in older (few months earlier) version too. CF card contains only one broken file without name (0 kB) and one broken folder "MLVI4" (0 kB) after this crash. But CF card is not empty (after last crash: used 3.97 GB from 29.8 GB). I had this problem on all my CF cards (Transcend UDMA 7 600x 32GB, Lexar Professional UDMA 7 1000x 64GB).
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Issue #2022 resolved