Canon 7D with magiclantern-Nightly.2015Mar02.7D203
I used the intervalometer twice for some dayshots this weekend, just letting it run until it ran out of of battery power. Each time, when I switched the camera on again with a fresh battery, it complained that it did not shut down correctly and then loaded the default (i.e. not ML) firmware.
One of the other guys in our group commented that this has caused a corrupted memory card for him in the past.